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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/12/1999 |
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Data da última atualização: |
03/03/2010 |
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Autoria: |
TANNUS, T. A.; PANEPUCCI, H. C.; POSADAS, D. A.; CRESTANA, S. |
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Afiliação: |
USP-IFSC; Universidade Estadual de Ponta Grossa; EMBRAPA-CNPDIA. |
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Título: |
Dynamic imaging approach for 3-D preferential flow within stratified soil samples. |
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Ano de publicação: |
1994 |
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Fonte/Imprenta: |
In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 17., jun. 1994, Caxambu, MG. Resumos... Sao Paulo: Sociedade Brasileira de Fisica, 1994. |
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Páginas: |
p.296. |
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Idioma: |
Inglês |
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Conteúdo: |
It describes a new NMR imaging approach to investigate the dynamics of the soil "fingering" phenomenum. To study the "fingering" dynamics a fast experiment was performed to follow only the water front (no image reconstruction), constructed by curves that resembles the wetting profile in vertical slices of a soil sample. A cubic 15x15x15cm3 double-layer sand column simulates the stratified soil. Spin-echo signals with phase encoding along vertical axis (gravitational direction) were acquired, but with phase encoding gradient off, giving 16 acquisitions of 7 transverse slices in a 3 minutes experiment. After suitable treatment, the water front and the horizontal distribution at each measured time of the water infiltration was obtained. Normalizing the signal intensities to the soil column dimensions and using computational graphics resources it was possible to quantify the number of fingers and their spatial and temporal variability. The column was also imaged in a 500 Gauss NMR tomograph under conventional SE methodology. Coronal, transverse and sagittal images of the column were acquired under water steady-state flow providing three-dimensional information regarding the number of fingers, their sizes and diameters, to be compared to the dynamic images. The results to be shown elects this approach of magnetic resonance imaging as a valuable tool for non-invasive study of the dynamics of soil "fingering" and other fast changing phenomena. |
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Palavras-Chave: |
3-D; Dynamic imaging; NMR; Nuclear magnetic resonance; Stratified soil samples; Three-dimensional. |
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Thesaurus Nal: |
preferential flow. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02248naa a2200253 a 4500
001 1027219
005 2010-03-03
008 1994 bl --- 0-- u #d
100 1 $aTANNUS, T. A.
245 $aDynamic imaging approach for 3-D preferential flow within stratified soil samples.
260 $c1994
300 $ap.296.
520 $aIt describes a new NMR imaging approach to investigate the dynamics of the soil "fingering" phenomenum. To study the "fingering" dynamics a fast experiment was performed to follow only the water front (no image reconstruction), constructed by curves that resembles the wetting profile in vertical slices of a soil sample. A cubic 15x15x15cm3 double-layer sand column simulates the stratified soil. Spin-echo signals with phase encoding along vertical axis (gravitational direction) were acquired, but with phase encoding gradient off, giving 16 acquisitions of 7 transverse slices in a 3 minutes experiment. After suitable treatment, the water front and the horizontal distribution at each measured time of the water infiltration was obtained. Normalizing the signal intensities to the soil column dimensions and using computational graphics resources it was possible to quantify the number of fingers and their spatial and temporal variability. The column was also imaged in a 500 Gauss NMR tomograph under conventional SE methodology. Coronal, transverse and sagittal images of the column were acquired under water steady-state flow providing three-dimensional information regarding the number of fingers, their sizes and diameters, to be compared to the dynamic images. The results to be shown elects this approach of magnetic resonance imaging as a valuable tool for non-invasive study of the dynamics of soil "fingering" and other fast changing phenomena.
650 $apreferential flow
653 $a3-D
653 $aDynamic imaging
653 $aNMR
653 $aNuclear magnetic resonance
653 $aStratified soil samples
653 $aThree-dimensional
700 1 $aPANEPUCCI, H. C.
700 1 $aPOSADAS, D. A.
700 1 $aCRESTANA, S.
773 $tIn: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 17., jun. 1994, Caxambu, MG. Resumos... Sao Paulo: Sociedade Brasileira de Fisica, 1994.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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| Registros recuperados : 26 | |
| 18. |  | POSADAS, D. A.; TANNUS, A.; PANEPUCCI, H. C.; ONODY, R. N.; CRESTANA, S. Caracterização e simulação da instabilidade hidrodinâmica em um meio poroso não-saturado. In: ENCONTRO SOBRE ESCOAMENTO EM MEIOS POROSOS-ENEMP, 22., out. 1994, Florianopolis, SC. Programacao e resumos... Florianopolis: UFSC-Centro Tecnologico, 1994. p.113.| Biblioteca(s): Embrapa Instrumentação. |
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| 19. | | POSADAS, D. A.; TANNUS, A.; PANEPUCCI, H. C.; LOTUFO, R.; CRESTANA, S. Estudo em duas e três dimensões do fluxo preferencial, em solos não-saturados, através de imagens tomográficas. In: CONGRESSO BRASILEIRO DE CIENCIA DO SOLO - CERRADOS: FRONTEIRA AGRICOLA NO SECULO XXI, 24., jul. 1993, Goiania, GO. Resumos... Goiania: Sociedade Brasileira de Ciencia do Solo, 1993. p.99-100. Ref.44.| Biblioteca(s): Embrapa Instrumentação. |
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| 20. | | POSADAS, D. A. N.; ONODY, R. N.; TANNUS, A.; PANEPUCCI, C. H.; CRESTANA, S. Estudo da infiltração preferencial em 3-D, em um meio poroso, através de imagens e percolação por invasão. In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 19., set. 1996, Aguas de Lindoia, SP. Resumos... Sao Paulo: Sociedade Brasileira de Fisica, 1996. p. 545.| Biblioteca(s): Embrapa Instrumentação. |
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| Registros recuperados : 26 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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