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Registro Completo |
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Biblioteca(s): |
Embrapa Roraima. |
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Data corrente: |
26/03/2010 |
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Data da última atualização: |
08/04/2019 |
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Tipo da produção científica: |
Documentos |
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Autoria: |
BRAGA, R. M.; CORDEIRO, A. C. C.; MARIANO, F. S.; MARIANO, F. S. |
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Afiliação: |
RAMAYANA MENEZES BRAGA, CPAF-RR; ANTONIO CARLOS CENTENO CORDEIRO, CPAF-RR; Fabíola da Silva Mariano, UFRR; Fabiana da Silva Mariano, UFRR. |
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Título: |
Mercado varejista de arroz em Boa Vista, Roraima. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Boa Vista, RR: Embrapa Roraima, 2009. |
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Série: |
(Embrapa Roraima. Documentos, 18). |
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Idioma: |
Português |
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Palavras-Chave: |
Roraima. |
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Thesagro: |
Arroz; Mercado Varejista. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/195609/1/doc182009-mercvarejistaarroz-ramayana.pdf
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Marc: |
LEADER 00498nam a2200181 a 4500
001 1696615
005 2019-04-08
008 2009 bl uuuu u0uu1 u #d
100 1 $aBRAGA, R. M.
245 $aMercado varejista de arroz em Boa Vista, Roraima.
260 $aBoa Vista, RR: Embrapa Roraima$c2009
490 $a(Embrapa Roraima. Documentos, 18).
650 $aArroz
650 $aMercado Varejista
653 $aRoraima
700 1 $aCORDEIRO, A. C. C.
700 1 $aMARIANO, F. S.
700 1 $aMARIANO, F. S.
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Embrapa Roraima (CPAF-RR) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
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: |
03/08/2009 |
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Autoria: |
CRESTANA, S.; POSADAS, A. N. |
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Afiliação: |
EMBRAPA-CNPDIA; Universidade de Ponta Grossa. |
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Título: |
2-D and 3-D fingering in unsaturated soils investigated by fractal analysis, invasion percolation modeling and non-destructive image processing. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
In: BAVEYE, P.; PARLANGE, J.Y.; STEWART, B.A., (Ed.). Fractals in soil science. Boca Raton: CRC, 1998. p.293-332. |
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Série: |
(Advances in Soil Science). |
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ISBN: |
1-56670-105-8 |
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Idioma: |
Inglês |
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Conteúdo: |
In this chapter we described current scientific research in relation to fingering phenomena in soils, as well as applications of fractal theory, invasion percolation theory and imaging techniques as non-desctructive and advanced methods in the study of such phenomena. Those studies showed that the perimeter of the finger displacement fronts represents a behavior of "self-affine" fractal or fractal type, its fractal dimension Dp being dependent on the time and the position along the profile of the soil column. Through the fractal dimension, it was also evident that the "dynamic" surface tension is dependent on Dp and the average pore diameter of the porous system. On the other hand, it was verified, by means of several experiments, that the fractal characteristics of the fingers, under the same initial conditions, are related to the soil granulometry or the pore-size distribution. For fine-textured soils the structure of the fingers presents statistically self-affine or fractal characteristics. In addition to these results, it was also possible to introduce a modified theory of invasion percolation, so as to simulate the fingers structure. The tomography and imaging techniques employed are already available, through nuclear magnetic resonance as well as through X-ray, and presented very innovative and encouraging results for the study of fingering phenomena in soils and porous media in general, allowing us, among other things, to witness, non-destructively, the three-dimensional and aleatory character of the phenomena. Nevertheless, great research challenges remain. It is needed, for instance, to better relate the "effective" surface tension to the fractal dimension of the fingers, the passage from non-fractality to the fractal behavior of the finger structure in relation to the soil granulometry, and the pore profile distribution to the phenomenon occurrence. Concomitantly, the exploration and the development of more appropriate methods to measure their morphological and physical characteristics, in 2 and 3 dimensions, establish an important challenge to be faced in the near future. MenosIn this chapter we described current scientific research in relation to fingering phenomena in soils, as well as applications of fractal theory, invasion percolation theory and imaging techniques as non-desctructive and advanced methods in the study of such phenomena. Those studies showed that the perimeter of the finger displacement fronts represents a behavior of "self-affine" fractal or fractal type, its fractal dimension Dp being dependent on the time and the position along the profile of the soil column. Through the fractal dimension, it was also evident that the "dynamic" surface tension is dependent on Dp and the average pore diameter of the porous system. On the other hand, it was verified, by means of several experiments, that the fractal characteristics of the fingers, under the same initial conditions, are related to the soil granulometry or the pore-size distribution. For fine-textured soils the structure of the fingers presents statistically self-affine or fractal characteristics. In addition to these results, it was also possible to introduce a modified theory of invasion percolation, so as to simulate the fingers structure. The tomography and imaging techniques employed are already available, through nuclear magnetic resonance as well as through X-ray, and presented very innovative and encouraging results for the study of fingering phenomena in soils and porous media in general, allowing us, among other things, to witness, non-destructively, the three-dimensio... Mostrar Tudo |
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Palavras-Chave: |
Ciencia do solo; Fractais; Fractals; Image processing; Modelamento; Modeling; Processamento de imagem; Solos nao-saturados; Unsaturated soils. |
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Thesaurus NAL: |
soil science. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03011naa a2200277 a 4500
001 1027271
005 2009-08-03
008 1998 bl --- 0-- u #d
020 $a1-56670-105-8
100 1 $aCRESTANA, S.
245 $a2-D and 3-D fingering in unsaturated soils investigated by fractal analysis, invasion percolation modeling and non-destructive image processing.
260 $c1998
490 $a(Advances in Soil Science).
520 $aIn this chapter we described current scientific research in relation to fingering phenomena in soils, as well as applications of fractal theory, invasion percolation theory and imaging techniques as non-desctructive and advanced methods in the study of such phenomena. Those studies showed that the perimeter of the finger displacement fronts represents a behavior of "self-affine" fractal or fractal type, its fractal dimension Dp being dependent on the time and the position along the profile of the soil column. Through the fractal dimension, it was also evident that the "dynamic" surface tension is dependent on Dp and the average pore diameter of the porous system. On the other hand, it was verified, by means of several experiments, that the fractal characteristics of the fingers, under the same initial conditions, are related to the soil granulometry or the pore-size distribution. For fine-textured soils the structure of the fingers presents statistically self-affine or fractal characteristics. In addition to these results, it was also possible to introduce a modified theory of invasion percolation, so as to simulate the fingers structure. The tomography and imaging techniques employed are already available, through nuclear magnetic resonance as well as through X-ray, and presented very innovative and encouraging results for the study of fingering phenomena in soils and porous media in general, allowing us, among other things, to witness, non-destructively, the three-dimensional and aleatory character of the phenomena. Nevertheless, great research challenges remain. It is needed, for instance, to better relate the "effective" surface tension to the fractal dimension of the fingers, the passage from non-fractality to the fractal behavior of the finger structure in relation to the soil granulometry, and the pore profile distribution to the phenomenon occurrence. Concomitantly, the exploration and the development of more appropriate methods to measure their morphological and physical characteristics, in 2 and 3 dimensions, establish an important challenge to be faced in the near future.
650 $asoil science
653 $aCiencia do solo
653 $aFractais
653 $aFractals
653 $aImage processing
653 $aModelamento
653 $aModeling
653 $aProcessamento de imagem
653 $aSolos nao-saturados
653 $aUnsaturated soils
700 1 $aPOSADAS, A. N.
773 $tIn: BAVEYE, P.; PARLANGE, J.Y.; STEWART, B.A., (Ed.). Fractals in soil science. Boca Raton: CRC, 1998. p.293-332.
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