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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
07/02/2022 |
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Data da última atualização: |
24/03/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
TEAL, P. D.; NOVOTNY, E. H. |
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Afiliação: |
PAUL D. TEAL, VICTORIA UNIVERSITY OF WELLINGTON; ETELVINO HENRIQUE NOVOTNY, CNPS. |
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Título: |
Improved data efficiency for NMR diffusion-relaxation processing. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Journal of Magnetic Resonance, v. 335, 107124, Feb. 2022. |
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DOI: |
https://doi.org/10.1016/j.jmr.2021.107124 |
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Idioma: |
Inglês |
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Conteúdo: |
Two dimensional diffusion and transverse () NMR relaxation measurements are effective for a variety of research and industrial processes. Conversion of the measurements into a D- map is performed using an inverse integral transformation. A difficulty with D- estimation from data acquired without pulsed field gradients (using, for example, the inherent static field gradient of a single-sided magnet) is that the diffusion and relaxation kernels are coupled. One commonly used solution is to introduce a time offset to enable the kernels to be decoupled, but this has the undesirable results of causing some of the data, and a large proportion of the signal energy, to become unusable. This paper presents two methods of processing the data that do not require this wastage. Both methods are based on insights that arise from considering the linear operator that describes the forwards integral transformation. One method involves data compression, while the other method is an application (that we call FLINT) of the fast iterative soft thresholding algorithm. Both methods are able to use all of the available data. The paper demonstrates the improved accuracy that results from these methods on simulated data, as well as the improved discovery of important features on measured data. |
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Palavras-Chave: |
BRD; Diffusion-edited CPMG; Diffusion-relaxation distribution; FLINT; Inversion; Static gradient. |
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Thesaurus Nal: |
Estimation. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 01964naa a2200229 a 4500
001 2139745
005 2022-03-24
008 2022 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.jmr.2021.107124$2DOI
100 1 $aTEAL, P. D.
245 $aImproved data efficiency for NMR diffusion-relaxation processing.$h[electronic resource]
260 $c2022
520 $aTwo dimensional diffusion and transverse () NMR relaxation measurements are effective for a variety of research and industrial processes. Conversion of the measurements into a D- map is performed using an inverse integral transformation. A difficulty with D- estimation from data acquired without pulsed field gradients (using, for example, the inherent static field gradient of a single-sided magnet) is that the diffusion and relaxation kernels are coupled. One commonly used solution is to introduce a time offset to enable the kernels to be decoupled, but this has the undesirable results of causing some of the data, and a large proportion of the signal energy, to become unusable. This paper presents two methods of processing the data that do not require this wastage. Both methods are based on insights that arise from considering the linear operator that describes the forwards integral transformation. One method involves data compression, while the other method is an application (that we call FLINT) of the fast iterative soft thresholding algorithm. Both methods are able to use all of the available data. The paper demonstrates the improved accuracy that results from these methods on simulated data, as well as the improved discovery of important features on measured data.
650 $aEstimation
653 $aBRD
653 $aDiffusion-edited CPMG
653 $aDiffusion-relaxation distribution
653 $aFLINT
653 $aInversion
653 $aStatic gradient
700 1 $aNOVOTNY, E. H.
773 $tJournal of Magnetic Resonance$gv. 335, 107124, Feb. 2022.
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Registro original: |
Embrapa Solos (CNPS) |
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Biblioteca |
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Origem |
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Classificação |
Cutter |
Registro |
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URL |
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
03/10/1995 |
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Data da última atualização: |
30/08/2018 |
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Tipo da produção científica: |
Folder/Folheto/Cartilha |
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Autoria: |
RICHE, G. R.; MANTOVANI, L. E. |
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Afiliação: |
Gilles Robert Riché, Consultor CPATSA; Luiz Eduardo Mantovani, CPATSA. |
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Título: |
Caracterização geo-ambiental do município de Poço Redondo - SE. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
Petrolina: EMBRAPA-CPATSA, 1985. |
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Páginas: |
n.p. |
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Descrição Física: |
3 mapas. |
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Idioma: |
Português |
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Conteúdo: |
Trata sobre o municipio de Poco Redondo (SE): localizacao, extensao, populacao, clima, geologia, vegetacao, relevo, hidrografia, as unidades geo-ambientais, as grande unidades de solos, os quadros agrario e agricola, recomendacoes e sugestoes complementares. Anexo: roteiro metodologico para o zoneamento geo-ambiental a nivel de municipio no Estado de Sergipe. |
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Palavras-Chave: |
Brasil; Extensao; Extension; Hydrography; Localizacao; Localization; Poco Redondo; Recursos naturais; Relatorio; Relievo; Sergipe. |
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Thesagro: |
Ecologia; Geologia; Hidrografia; População; Relevo; Solo; Vegetação. |
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Thesaurus NAL: |
Brazil; ecology; geology; population; Soil; vegetation. |
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Categoria do assunto: |
--
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/182120/1/FL-11158.pdf
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Marc: |
LEADER 01345nam a2200421 a 4500
001 1133055
005 2018-08-30
008 1985 bl uuuu u0uu1 u #d
100 1 $aRICHE, G. R.
245 $aCaracterização geo-ambiental do município de Poço Redondo - SE.
260 $aPetrolina: EMBRAPA-CPATSA$c1985
300 $an.p.$c3 mapas.
520 $aTrata sobre o municipio de Poco Redondo (SE): localizacao, extensao, populacao, clima, geologia, vegetacao, relevo, hidrografia, as unidades geo-ambientais, as grande unidades de solos, os quadros agrario e agricola, recomendacoes e sugestoes complementares. Anexo: roteiro metodologico para o zoneamento geo-ambiental a nivel de municipio no Estado de Sergipe.
650 $aBrazil
650 $aecology
650 $ageology
650 $apopulation
650 $aSoil
650 $avegetation
650 $aEcologia
650 $aGeologia
650 $aHidrografia
650 $aPopulação
650 $aRelevo
650 $aSolo
650 $aVegetação
653 $aBrasil
653 $aExtensao
653 $aExtension
653 $aHydrography
653 $aLocalizacao
653 $aLocalization
653 $aPoco Redondo
653 $aRecursos naturais
653 $aRelatorio
653 $aRelievo
653 $aSergipe
700 1 $aMANTOVANI, L. E.
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Embrapa Semiárido (CPATSA) |
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