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      Evaluation of Multiple-Scale 3D Characterization for Coal Physical Structure with DCM Method and Synchrotron X-Ray CT

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          Abstract

          Multiscale nondestructive characterization of coal microscopic physical structure can provide important information for coal conversion and coal-bed methane extraction. In this study, the physical structure of a coal sample was investigated by synchrotron-based multiple-energy X-ray CT at three beam energies and two different spatial resolutions. A data-constrained modeling (DCM) approach was used to quantitatively characterize the multiscale compositional distributions at the two resolutions. The volume fractions of each voxel for four different composition groups were obtained at the two resolutions. Between the two resolutions, the difference for DCM computed volume fractions of coal matrix and pores is less than 0.3%, and the difference for mineral composition groups is less than 0.17%. This demonstrates that the DCM approach can account for compositions beyond the X-ray CT imaging resolution with adequate accuracy. By using DCM, it is possible to characterize a relatively large coal sample at a relatively low spatial resolution with minimal loss of the effect due to subpixel fine length scale structures.

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          Most cited references21

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          Experimental study and modelling of methane adsorption and diffusion in shale

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            Adsorption and gas transport in coal microstructure: investigation and evaluation by quantitative X-ray CT imaging

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              Advanced characterization of pores and fractures in coals by nuclear magnetic resonance and X-ray computed tomography

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                Author and article information

                Journal
                ScientificWorldJournal
                ScientificWorldJournal
                TSWJ
                The Scientific World Journal
                Hindawi Publishing Corporation
                2356-6140
                1537-744X
                2015
                10 March 2015
                : 2015
                : 414262
                Affiliations
                1Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan, Shanxi 030006, China
                2CSIRO, Private Bag Box 33, Clayton, VIC 3169, Australia
                3State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, China
                4College of Physics & Electronics Engineering, Shanxi University, Taiyuan, Shanxi 030006, China
                5Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
                Author notes

                Academic Editor: Wenjun Jiang

                Author information
                http://orcid.org/0000-0002-1944-722X
                Article
                10.1155/2015/414262
                4377518
                f951d282-98c3-4b1c-9fda-76e0d1367614
                Copyright © 2015 Haipeng Wang et al.

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 24 June 2014
                : 14 July 2014
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