Найдено: 3
Overview ISO 7404-4:2017 - Methods for the petrographic analysis of coals (Part 4) defines a standardized point-count procedure for determining the proportions of microlithotypes, carbominerite and m…
Overview ISO 7404-4:2025 - Coal - Methods for petrographic analysis - Part 4 specifies a standardized point-count method for determining the proportions of microlithotypes, carbominerite and minerite…
1 Scope This document specifies a method, using a graticule with 20 crossline intersections, for determining the proportions of microlithotypes, carbominerite and minerite in coals. It applies only t…