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Gas diffusion coefficient in coal: calculation of tangent slope accuracy through the inflection point determination

2016Journal article Restricted access
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dc.contributor.authorRodrigues, Cristina
dc.contributor.authorDinis, Maria Alzira Pimenta
dc.contributor.authorLemos de Sousa, M. J.
dc.date.accessioned2019-09-16T08:26:43Z
dc.date.available2019-09-16T08:26:43Z
dc.date.issued2016
dc.descriptionhttp://sherpa.ac.uk/romeo/issn/1062-7391/pt_PT
dc.description.abstractThis investigation aims to develop an accurate method to calculate the tangent slope (b) - a fundamental parameter to calculate gas diffusion coefficients under different pressures - using inflection point determinations. The authors also studied the different tangent slope behaviours depending on the experimental gas sorption used. The single Langmuir model, for individual gases, and the extended Langmuir model, for multicomponent gas mixtures, were applied to fit experimental gas sorption isotherm data. Two coals were selected in order to minimize and/or avoid the maceral composition and vitrinite mean random reflectance effects. Samples were submitted to three different gas compositions, viz. 99.999% CH4; 99.999% CO2; and a gas mixture containing 74.99% CH4 + 19.99% CO2 + 5.02% N2. Results showed that the first and the second derivatives calculated to define the first inflection points represent exactly the final limit of tangent slopes.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAPA: Rodrigues, C. F., Dinis, M. A. P., & Lemos de Sousa, M. J. (2016). Gas Diffusion Coefficient in Coal: Calculation of Tangent Slope Accuracy Through the Inflection Point Determination. Journal of Mining Science, 52(1), 87-101. doi:10.1134/s1062739116010162pt_PT
dc.identifier.doi10.1134/S1062739116010162pt_PT
dc.identifier.issn1573-8736
dc.identifier.urihttp://hdl.handle.net/10284/7899
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringer Verlagpt_PT
dc.relation.publisherversionhttps://link.springer.com/article/10.1134%2FS1062739116010162pt_PT
dc.subjectDiffusionpt_PT
dc.subjectDiffusion coefficientpt_PT
dc.subjectSorptionpt_PT
dc.subjectInflection pointpt_PT
dc.subjectTangent slopept_PT
dc.titleGas diffusion coefficient in coal: calculation of tangent slope accuracy through the inflection point determinationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage101pt_PT
oaire.citation.issue1pt_PT
oaire.citation.startPage87pt_PT
oaire.citation.titleFiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh / Journal of Mining Sciencept_PT
oaire.citation.volume52pt_PT
person.familyNameRodrigues
person.familyNameDinis
person.familyNameLemos de Sousa
person.givenNameCristina Fernanda Alves
person.givenNameMaria Alzira Pimenta
person.givenNameManuel João
person.identifier493996
person.identifier493603
person.identifier.ciencia-id7419-A932-CEC5
person.identifier.ciencia-id4710-147D-FDAF
person.identifier.ciencia-idD513-C4C7-E740
person.identifier.orcid0000-0002-7616-6985
person.identifier.orcid0000-0002-2198-6740
person.identifier.orcid0000-0001-6527-6196
person.identifier.ridF-3309-2011
person.identifier.scopus-author-id55925912600
person.identifier.scopus-author-id55539804000
person.identifier.scopus-author-id6602492063
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication0fefd103-d5e6-455d-b7b7-06440a7f4229
relation.isAuthorOfPublication1e85592a-e8e2-4aea-bd8e-1007c94388c0
relation.isAuthorOfPublication580f4519-5525-4616-8174-c912b1a3c88f
relation.isAuthorOfPublication.latestForDiscovery580f4519-5525-4616-8174-c912b1a3c88f

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