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Registro Completo |
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Biblioteca(s): |
Embrapa Agricultura Digital. |
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Data corrente: |
03/07/1996 |
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Data da última atualização: |
08/10/2010 |
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Autoria: |
COUTINHO, A. L. G. A.; ALVES, J. L. D. |
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Afiliação: |
ALVARO L. G. A. COUTINHO, COPPE/UFRJ; JOSÉ L. D. ALVES, COPPE/UFRJ. |
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Título: |
Parallel finite element simulation of tracer injection in oil reservoirs. |
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Ano de publicação: |
1995 |
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Fonte/Imprenta: |
In: SIMPÓSIO BRASILEIRO DE ARQUITETURA DE COMPUTADORES - PROCESSAMENTO DE ALTO DESEMPENHO, 7.; CONGRESSO BRASILEIRO DA SOCIEDADE BRASILEIRA DE COMPUTAÇÃO, 15., 1995, Canela. Anais... Porto Alegre: UFRGS, Instituto de Informática, 1995. |
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Páginas: |
p. 199-211. |
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Idioma: |
Inglês |
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Conteúdo: |
In this work, parallel finite element techniques for the simulation of tracer injection in oil reservoirs are addressed. The pressure equation is aproximated by Galerkin's method and the velociity field computed through a post-processing approach to recover the required accuracy. The concentration equation is approximated in space by the Streamline Upwind Petrov Galerkin (SUPG) plus a discontinuity-capturing operator. The resulting semi-discrete equations are approximated in time by a predictor-multicorrector algorithm. The pressure, velocity and concentration linear systems of equations are solved with parallel element-by-element iterative techniques. Performance measurements on the CRAY YMP and the CRAY C90 for the injection of tracer on a five-spot pattern with random small scale permeability variations are performed to demonstrate that the numerical techniques employed are accurate and result in a fast code. |
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Palavras-Chave: |
Mathematical model; Modelagem; Simulation of tracer injection. |
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Thesagro: |
Simulação. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01665naa a2200193 a 4500
001 1002842
005 2010-10-08
008 1995 bl uuuu u00u1 u #d
100 1 $aCOUTINHO, A. L. G. A.
245 $aParallel finite element simulation of tracer injection in oil reservoirs.
260 $c1995
300 $ap. 199-211.
520 $aIn this work, parallel finite element techniques for the simulation of tracer injection in oil reservoirs are addressed. The pressure equation is aproximated by Galerkin's method and the velociity field computed through a post-processing approach to recover the required accuracy. The concentration equation is approximated in space by the Streamline Upwind Petrov Galerkin (SUPG) plus a discontinuity-capturing operator. The resulting semi-discrete equations are approximated in time by a predictor-multicorrector algorithm. The pressure, velocity and concentration linear systems of equations are solved with parallel element-by-element iterative techniques. Performance measurements on the CRAY YMP and the CRAY C90 for the injection of tracer on a five-spot pattern with random small scale permeability variations are performed to demonstrate that the numerical techniques employed are accurate and result in a fast code.
650 $aSimulação
653 $aMathematical model
653 $aModelagem
653 $aSimulation of tracer injection
700 1 $aALVES, J. L. D.
773 $tIn: SIMPÓSIO BRASILEIRO DE ARQUITETURA DE COMPUTADORES - PROCESSAMENTO DE ALTO DESEMPENHO, 7.; CONGRESSO BRASILEIRO DA SOCIEDADE BRASILEIRA DE COMPUTAÇÃO, 15., 1995, Canela. Anais... Porto Alegre: UFRGS, Instituto de Informática, 1995.
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Registro original: |
Embrapa Agricultura Digital (CNPTIA) |
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Registro Completo
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
17/08/2021 |
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Data da última atualização: |
20/09/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
LOPES, F. C. F.; RIBEIRO, C. G. S.; RODRIGUEZ, N. M.; GAMA, M. A. S. da; MORENZ, M. J. F. |
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Afiliação: |
FERNANDO CESAR FERRAZ LOPES, CNPGL; CARLOS GUSTAVO SANTOS RIBEIRO, Instituto Federal de Educação, Ciência e Tecnologia; NORBERTO MARIO RODRIGUEZ, Universidade Federal de Minas Gerais; MARCO ANTONIO SUNDFELD DA GAMA, CNPGL; MIRTON JOSE FROTA MORENZ, CNPGL. |
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Título: |
Short-term changes in plasma and milk fatty acid profiles in cows fed chopped elephant grass-based diets containing two types of sunflower oil associated with two methods of concentrate feeding. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Semina. Ciências Agrárias, v. 42, n. 3, p. 1853-1878, 2021. |
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DOI: |
http://doi.org/10.5433/1679-0359.2021v42n3Supl1p1853 |
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Idioma: |
Inglês |
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Notas: |
Suplemento. |
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Conteúdo: |
This study was carried out in a randomized block design in a 2 x 2 factorial arrangement with the aim of evaluating the short-term changes in the plasma and milk fatty acid (FA) profiles of Holstein x Gyr cows (444±84 kg; 75±31 days in milk; 15.4±4.8 kg day-1 of milk) fed 600 g kg-1 DM chopped elephant grass-based diets supplemented with 45 g kg-1 DM sunflower oil (SO) for 21 days. Two types of SO were evaluated: high oleic/low linoleic acid (HO) and medium oleic/medium linoleic acid (MO). The concentrates containing SO were supplied separately from forage twice a day (TAD) or as part of a total mixed ration (TMR). Temporal changes were analyzed by mixed models (P < 0.05) using six, four and seven repeated measures over time for FA intake and the plasma and milk FA compositions, respectively. There was higher oleic acid intake in HO SO-fed cows, while higher linoleic and α-linolenic acid intake were observed in MO SO-fed cows. TAD-fed cows had a higher plasma vaccenic acid content than TMR-fed cows, while MO SO-fed cows had higher plasma vaccenic and rumenic acid contents than HO SO-fed cows. As a function of day, there were linear increases in oleic and linoleic acid intake; plasma contents of oleic, vaccenic and linoleic acids; and the milk fat content of linoleic acid, while quadratic effects were adjusted for the milk fat contents of palmitic, oleic, vaccenic and rumenic acids. In comparison with TMR-fed cows, the milk fat of TAD-fed cows produced between days 13 and 17 showed an FA profile that was more nutritionally desirable for human health, with lower contents of hypercholesterolemic FAs and higher contents of oleic, rumenic and vaccenic acids. Between days 15 and 16, the vaccenic and rumenic acid contents in the milk fat of MO SO-fed cows were 81% higher than those obtained from HO SO-fed cows, which on the 14th day had a 14% higher oleic acid content in milk fat. Lower milk fat levels of hypercholesterolemic FAs were produced between days 13 and 14 by cows fed both types of SO. MenosThis study was carried out in a randomized block design in a 2 x 2 factorial arrangement with the aim of evaluating the short-term changes in the plasma and milk fatty acid (FA) profiles of Holstein x Gyr cows (444±84 kg; 75±31 days in milk; 15.4±4.8 kg day-1 of milk) fed 600 g kg-1 DM chopped elephant grass-based diets supplemented with 45 g kg-1 DM sunflower oil (SO) for 21 days. Two types of SO were evaluated: high oleic/low linoleic acid (HO) and medium oleic/medium linoleic acid (MO). The concentrates containing SO were supplied separately from forage twice a day (TAD) or as part of a total mixed ration (TMR). Temporal changes were analyzed by mixed models (P < 0.05) using six, four and seven repeated measures over time for FA intake and the plasma and milk FA compositions, respectively. There was higher oleic acid intake in HO SO-fed cows, while higher linoleic and α-linolenic acid intake were observed in MO SO-fed cows. TAD-fed cows had a higher plasma vaccenic acid content than TMR-fed cows, while MO SO-fed cows had higher plasma vaccenic and rumenic acid contents than HO SO-fed cows. As a function of day, there were linear increases in oleic and linoleic acid intake; plasma contents of oleic, vaccenic and linoleic acids; and the milk fat content of linoleic acid, while quadratic effects were adjusted for the milk fat contents of palmitic, oleic, vaccenic and rumenic acids. In comparison with TMR-fed cows, the milk fat of TAD-fed cows produced between days 13 an... Mostrar Tudo |
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Palavras-Chave: |
Ácido oleico; Ácido rumênico; Rumenic acid. |
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Thesagro: |
Ácido Linoléico; Pennisetum Purpureum. |
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Thesaurus NAL: |
Conjugated linoleic acid; Oleic acid. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/225268/1/Short-term-changes.pdf
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Marc: |
LEADER 03004naa a2200277 a 4500
001 2133648
005 2021-09-20
008 2021 bl uuuu u00u1 u #d
024 7 $ahttp://doi.org/10.5433/1679-0359.2021v42n3Supl1p1853$2DOI
100 1 $aLOPES, F. C. F.
245 $aShort-term changes in plasma and milk fatty acid profiles in cows fed chopped elephant grass-based diets containing two types of sunflower oil associated with two methods of concentrate feeding.$h[electronic resource]
260 $c2021
500 $aSuplemento.
520 $aThis study was carried out in a randomized block design in a 2 x 2 factorial arrangement with the aim of evaluating the short-term changes in the plasma and milk fatty acid (FA) profiles of Holstein x Gyr cows (444±84 kg; 75±31 days in milk; 15.4±4.8 kg day-1 of milk) fed 600 g kg-1 DM chopped elephant grass-based diets supplemented with 45 g kg-1 DM sunflower oil (SO) for 21 days. Two types of SO were evaluated: high oleic/low linoleic acid (HO) and medium oleic/medium linoleic acid (MO). The concentrates containing SO were supplied separately from forage twice a day (TAD) or as part of a total mixed ration (TMR). Temporal changes were analyzed by mixed models (P < 0.05) using six, four and seven repeated measures over time for FA intake and the plasma and milk FA compositions, respectively. There was higher oleic acid intake in HO SO-fed cows, while higher linoleic and α-linolenic acid intake were observed in MO SO-fed cows. TAD-fed cows had a higher plasma vaccenic acid content than TMR-fed cows, while MO SO-fed cows had higher plasma vaccenic and rumenic acid contents than HO SO-fed cows. As a function of day, there were linear increases in oleic and linoleic acid intake; plasma contents of oleic, vaccenic and linoleic acids; and the milk fat content of linoleic acid, while quadratic effects were adjusted for the milk fat contents of palmitic, oleic, vaccenic and rumenic acids. In comparison with TMR-fed cows, the milk fat of TAD-fed cows produced between days 13 and 17 showed an FA profile that was more nutritionally desirable for human health, with lower contents of hypercholesterolemic FAs and higher contents of oleic, rumenic and vaccenic acids. Between days 15 and 16, the vaccenic and rumenic acid contents in the milk fat of MO SO-fed cows were 81% higher than those obtained from HO SO-fed cows, which on the 14th day had a 14% higher oleic acid content in milk fat. Lower milk fat levels of hypercholesterolemic FAs were produced between days 13 and 14 by cows fed both types of SO.
650 $aConjugated linoleic acid
650 $aOleic acid
650 $aÁcido Linoléico
650 $aPennisetum Purpureum
653 $aÁcido oleico
653 $aÁcido rumênico
653 $aRumenic acid
700 1 $aRIBEIRO, C. G. S.
700 1 $aRODRIGUEZ, N. M.
700 1 $aGAMA, M. A. S. da
700 1 $aMORENZ, M. J. F.
773 $tSemina. Ciências Agrárias$gv. 42, n. 3, p. 1853-1878, 2021.
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Embrapa Gado de Leite (CNPGL) |
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