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Registro Completo |
Biblioteca(s): |
Embrapa Agroenergia. |
Data corrente: |
19/01/2015 |
Data da última atualização: |
02/02/2015 |
Autoria: |
VALADARES, L. F. |
Afiliação: |
LEONARDO FONSECA VALADARES, CNPAE. |
Título: |
Biobased fibers and materials in Brazil. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
Chemical and Biological Technologies in Agriculture, 1:16, 2014. |
Idioma: |
Português |
Palavras-Chave: |
Biobased materials; Biomass fractionation; Renewable fibers. |
Thesaurus Nal: |
cellulose; lignin; sugarcane bagasse. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00526naa a2200181 a 4500 001 2006023 005 2015-02-02 008 2014 bl uuuu u00u1 u #d 100 1 $aVALADARES, L. F. 245 $aBiobased fibers and materials in Brazil.$h[electronic resource] 260 $c2014 650 $acellulose 650 $alignin 650 $asugarcane bagasse 653 $aBiobased materials 653 $aBiomass fractionation 653 $aRenewable fibers 773 $tChemical and Biological Technologies in Agriculture, 1:16, 2014.
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Biblioteca(s): |
Embrapa Unidades Centrais. |
Data corrente: |
12/02/2015 |
Data da última atualização: |
25/05/2017 |
Autoria: |
SILVA, R. B. da; DIAS JUNIOR, M. de S.; SILVA, F. A. de M.; FOLLE, S. M.; FRANZ, C. A. B.; SOUZA, Z. M. de. |
Afiliação: |
REGINALDO BARBOZA DA SILVA; MOACIR DE SOUZA DIAS JUNIOR; FRANCISCA ALCIVÂNIA DE MELO SILVA; SERGIO MAURO FOLLE; CLAUDIO ALBERTO BENTO FRANZ, CPAC; ZIGOMAR MENEZES DE SOUZA. |
Título: |
Predition of soil shear strength in agricultural and natural environments of the Brazilian Cerrado. |
Ano de publicação: |
2015 |
Fonte/Imprenta: |
PESQUISA AGROPECUÁRIA BRASILEIRA, Brasília, DF, v. 50, n. 1, p. 82-91, jan., 2015. |
Idioma: |
Inglês |
Notas: |
Título em português: Predição da tensão de cisalhamento do solo em ambientes agrícola e natural do Cerrado brasileiro. |
Conteúdo: |
The objective of this work was to develop uni? and multivariate models to predict maximum soil shear strength (tmax) under different normal stresses (?n), water contents (U), and soil managements. The study was carried out in a Rhodic Haplustox under Cerrado (control area) and under no?tillage and conventional tillage systems. Undisturbed soil samples were taken in the 0.00?0.05 m layer and subjected to increasing U and ?n, in shear strength tests. The uni? and multivariate models ? respectively tmax=10(a+bU) and tmax=10(a+bU+csn) ? were significant in all three soil management systems evaluated and they satisfactorily explain the relationship between U, ?n, and tmax. The soil under Cerrado has the highest shear strength (t) estimated with the univariate model, regardless of the soil water content, whereas the soil under conventional tillage shows the highest values with the multivariate model, which were associated to the lowest water contents at the soil consistency limits in this management system. |
Palavras-Chave: |
Cohesion limits; Machine-ground interaction; Precompression stress. |
Thesaurus NAL: |
soil compaction. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/117910/1/Prediction-of-soil-shear.pdf
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Marc: |
LEADER 01877naa a2200241 a 4500 001 2008595 005 2017-05-25 008 2015 bl uuuu u00u1 u #d 100 1 $aSILVA, R. B. da 245 $aPredition of soil shear strength in agricultural and natural environments of the Brazilian Cerrado. 260 $c2015 500 $aTítulo em português: Predição da tensão de cisalhamento do solo em ambientes agrícola e natural do Cerrado brasileiro. 520 $aThe objective of this work was to develop uni? and multivariate models to predict maximum soil shear strength (tmax) under different normal stresses (?n), water contents (U), and soil managements. The study was carried out in a Rhodic Haplustox under Cerrado (control area) and under no?tillage and conventional tillage systems. Undisturbed soil samples were taken in the 0.00?0.05 m layer and subjected to increasing U and ?n, in shear strength tests. The uni? and multivariate models ? respectively tmax=10(a+bU) and tmax=10(a+bU+csn) ? were significant in all three soil management systems evaluated and they satisfactorily explain the relationship between U, ?n, and tmax. The soil under Cerrado has the highest shear strength (t) estimated with the univariate model, regardless of the soil water content, whereas the soil under conventional tillage shows the highest values with the multivariate model, which were associated to the lowest water contents at the soil consistency limits in this management system. 650 $asoil compaction 653 $aCohesion limits 653 $aMachine-ground interaction 653 $aPrecompression stress 700 1 $aDIAS JUNIOR, M. de S. 700 1 $aSILVA, F. A. de M. 700 1 $aFOLLE, S. M. 700 1 $aFRANZ, C. A. B. 700 1 $aSOUZA, Z. M. de 773 $tPESQUISA AGROPECUÁRIA BRASILEIRA, Brasília, DF$gv. 50, n. 1, p. 82-91, jan., 2015.
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