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2006
It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.
Physicochemical studies of natural zeolite and zeolite samples treated with different solutions of hydrochloric acid were carried out. The nitrogen adsorption technique and the BET model were used for determination of the specific surface area and the pore size distribution. It was shown that the optimal acid modification conditions facilitate the development of catalytically active forms of natural zeolite.