Analytical methods for coal and coal products, Volume 1 by Clarence Karr

By Clarence Karr

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The same correction factor may be used to con­ vert Ting's mean average reflectance, R tav/ to the mean maximum reflec­ tance Rmax· Rmax = 1 . 0 6 6 Rtav F. (8) Ting's 3A Maximum Reflectance, R 3a This is a modified method for direct measurement of maximum reflec­ tance of macerals. Polarized light is used in this measurement. Three readings are taken at 45° angular intervals and are designated as R lf R 2, and R3. The maximum reflectance is expressed as Rm ax = R s a = i ( « i + R a) + { * [ ( * 1 “ * 2) 2 + ( R 2 - R 3)2] } 112 (9) Ting's 3A maximum reflectance does not require the full revolution of the object stage, and is theoretically identical to the maximum reflec­ tance described in Section VI,B.

A STM Standard M anual, Part 26, pp. 212-2 16. ASTM (1975b). Standard D-2797. A ST M Standard M anual, Part 26, pp. 350 -354. B abu, S. , and Dutcher, R. R. (1966). Adv. Chem. 55, 284 -3 06 . Benedict, L. , Thom pson, R. , Sh ig o , J. , and A ikm an , R. P. (1968). Fuel 4 7 ,1 2 5 - 1 4 3 . B ow ie, S. H. U. (1967). In "P hy sical M ethods in D eterm inative M in eralog y " (J. ). A cadem ic Press, N ew York. , and Berry, W. F. (1965). Preparation and P olishin g of Coal and Coke for Petro­ graphic A nalysis.

Econ. Geol. 51, 5 21-527. Spackm an, W. (1958). Trans. Y. Acad. Sei. Ser. 2 20, 411 -4 23 . Sp ackm an, W. (1963). ). Centre Nat. de la Rech. , Paris. , Berry, W. , D utcher, R. , and Brisse, A. H. (1960). Proc. Regional Tech. Meeting, Am. , Birmingham, Alabama, pp. 4 03 -4 50 . , and M itchell, G. D. (1976). Brigham Young Univ. Geol. Stud. 22, Part 3, 5 9 -7 5. Teichm üller, M. (1950). Geol. Jb. 64, 4 2 9-48 8. Teichmüller, M. (1974a). Fortschr. Geol. Rheinld. Westf. 24, 3 7 -6 4 . Teichmüller, M.

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