Výsledky vyhledávání - "James A. Luppens"

Calorific value and compositional ultimate analysis with a case study of a Texas lignite

Autor: James A. Luppens, Juan José Egozcue, Ricardo A. Olea, Vera Pawlowsky-Glahn

Publikováno v: © International Journal of Coal Geology, 2016, vol. 162, p. 27-33
Articles publicats (D-IMA)
DUGiDocs – Universitat de Girona
instname

Measurements to determine coal quality as fuel include proximate analysis, ultimate analysis and calorific value. The latter is an attribute taking non-negative real values, so a simple transformation is sufficient for its spatial modeling applying g

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::366c76726096d74db325b0e25b3324e4
https://doi.org/10.1016/j.coal.2016.05.005

Zobrazit plný text záznamu

Mapping of coal quality using stochastic simulation and isometric logratio transformation with an application to a Texas lignite

Autor: Ricardo A. Olea, James A. Luppens

Publikováno v: International Journal of Coal Geology. 152:80-93

Coal is a chemically complex commodity that often contains most of the natural elements in the periodic table. Coal constituents are conventionally grouped into four components (proximate analysis): fixed carbon, ash, inherent moisture, and volatile

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f2a3a277252f79900a1a458b8b1b6946
https://doi.org/10.1016/j.coal.2015.10.003

Zobrazit plný text záznamu

Sequential Simulation Approach to Modeling of Multi-seam Coal Deposits with an Application to the Assessment of a Louisiana Lignite

Autor: Ricardo A. Olea, James A. Luppens

Publikováno v: Natural Resources Research. 21:443-459

There are multiple ways to characterize uncertainty in the assessment of coal resources, but not all of them are equally satisfactory. Increasingly, the tendency is toward borrowing from the statistical tools developed in the last 50 years for the qu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::10ca712fb6e0e904b020e996fefedf8e
https://doi.org/10.1007/s11053-012-9185-1

Zobrazit plný text záznamu

Methodology for quantifying uncertainty in coal assessments with an application to a Texas lignite deposit

Autor: James A. Luppens, Ricardo A. Olea, Susan J. Tewalt

Publikováno v: International Journal of Coal Geology. 85:78-90

A common practice for characterizing uncertainty in coal resource assessments has been the itemization of tonnage at the mining unit level and the classification of such units according to distance to drilling holes. Distance criteria, such as those

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1310dc59f161d666fa8c9b3737736b83
https://doi.org/10.1016/j.coal.2010.10.001

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání