Gaois

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  1. SCIENCE|natural and applied sciences|physical sciences|chemistry
    cónú agus ceathrúnú Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
    ga
    Aufkegeln und Vierteln | Kegeln und Vierteln
    de
    Comment Ein über der Mitte eines Kreuzes aus zwei senkrechten Wänden aufgeschütteter Gutkegel wird durch eben diese Wände geviertelt. Je zwei gegenüberliegende Mengen werden zur Teilprobe vereinigt, die beiden anderen Viertel verworfen. Diese Mengenhalbierung wird bis zum Erreichen der Labor- bzw. Analysenmenge fortgesetzt.Quelle: Stieß Matthias, "Mechanische Verfahrenstechnik – Partikeltechnologie 1", 3. Aufl., Springer, Berlin, ISBN 978-3-540-32551-2, S. 244-245."
    coning and quartering
    en
    Definition reduction in size of a granular or powdered sample by forming a conical heap which is spread out into a circular, flat cake. The cake is divided radially into quarters and two opposite quarters are combined. The other two quarters are discarded Reference IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version, 2006 - created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8 http://goldbook.iupac.org/C01265.html [1.9.2009]
    Comment The process is repeated as many times as necessary to obtain the quantity desired for some final use (e.g. as the laboratory sample or as the test sample). If the process is performed only once, coning and quartering is no more efficient than taking alternate portions and discarding the others.
    méthode de quartage | méthode des quartiers opposés
    fr