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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal; Embrapa Tabuleiros Costeiros. |
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Data corrente: |
23/06/1997 |
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Data da última atualização: |
10/01/2011 |
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Autoria: |
LIMA, A. D. F.; CRUZ, H. M. da. |
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Título: |
O anel vermelho do coqueiro (1); subsídios para o seu estudo. |
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Ano de publicação: |
1945 |
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Fonte/Imprenta: |
Boletim Fitossanitário, Rio de Janeiro, v. 2, n. 2, p. 87-114, 1945. |
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Idioma: |
Português |
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Conteúdo: |
O coqueiro da praia (Cocos nucifera), também conhecido por coqueiro da Bahia, vem desempenhando papel importante na vida econômica de vários estados do Brasil. Vegetal de grande longevidade e de produção, continua durante 80 anos ou mais, ocupando uma estreita faixa de solo geralmente arenoso e pobre do nosso litoral, que dificilmente seria produtivo se ocupado com outras culturas, o coqueiro tem sido um dos principais fatores de estabilidade e bem estar das populalções litorâneas da região nordestina, embora a nossa produção anual por pe seja baix´xssima em relação ao que se verifica em outras partes do mundo onde se cultiva o coqueiro. |
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Palavras-Chave: |
Coconut; Coqueiro; Disease; Diseases; Doenças; Red ring. |
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Thesagro: |
Anel Vermelho; Coco; Cocos Nucifera; Doença. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01301naa a2200253 a 4500
001 1367207
005 2011-01-10
008 1945 bl --- 0-- u #d
100 1 $aLIMA, A. D. F.
245 $aO anel vermelho do coqueiro (1); subsídios para o seu estudo.
260 $c1945
520 $aO coqueiro da praia (Cocos nucifera), também conhecido por coqueiro da Bahia, vem desempenhando papel importante na vida econômica de vários estados do Brasil. Vegetal de grande longevidade e de produção, continua durante 80 anos ou mais, ocupando uma estreita faixa de solo geralmente arenoso e pobre do nosso litoral, que dificilmente seria produtivo se ocupado com outras culturas, o coqueiro tem sido um dos principais fatores de estabilidade e bem estar das populalções litorâneas da região nordestina, embora a nossa produção anual por pe seja baix´xssima em relação ao que se verifica em outras partes do mundo onde se cultiva o coqueiro.
650 $aAnel Vermelho
650 $aCoco
650 $aCocos Nucifera
650 $aDoença
653 $aCoconut
653 $aCoqueiro
653 $aDisease
653 $aDiseases
653 $aDoenças
653 $aRed ring
700 1 $aCRUZ, H. M. da
773 $tBoletim Fitossanitário, Rio de Janeiro$gv. 2, n. 2, p. 87-114, 1945.
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Registro original: |
Embrapa Tabuleiros Costeiros (CPATC) |
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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: |
11/08/2020 |
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Data da última atualização: |
16/08/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 4 |
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Autoria: |
SILVA, D. W.; SCATOLINO, M. V.; PEREIRA, T. G. T.; VILELA, A. P.; EUGENIO, T. M. C.; MARTINS, M. A.; MENDES, R. F.; BUFALINO, L.; TONOLI, G. H. D.; MENDES, L. M. |
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Afiliação: |
MARIA ALICE MARTINS, CNPDIA. |
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Título: |
Influence of thermal treatment of eucalyptus fibers on the physical-mechanical properties of extruded fiber-cement composites. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Materials Today: Proceedings, v. 31, 2020. |
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Páginas: |
S348-S352 |
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ISSN: |
2214-7853 |
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DOI: |
https://doi.org/10.1016/j.matpr.2020.04.764 |
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Idioma: |
Inglês |
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Conteúdo: |
This study proposes to evaluate the effect of the heat treatment in commercial eucalyptus fibers (produced by thermo-mechanical process) on the physical-mechanical properties of extruded fiber-cements composites. The fibers were treated with different temperatures of heat treatment (140, 170, 200 and 230 °C) for 60 min in a “Macro-ATG” oven. The chemical and morphological characteristics of the natural fibers were evaluated before and after the thermal treatment. The cementitious paste was composed by 67.9% cement, 29.1% limestone and 3% eucalyptus fibers. Hydroxypropylmethylcellulose (HPMC) and polyether carboxylic acid (ADVA 175) were added to the cement paste both in 1% (based on the cement mass) to facilitate the extrusion process. The thermal treatments at 200 and 230 °C were efficient in reducing the extractives content. On the other hand, a decrease in length, diameter and lumen size of the fibers has occurred. The decrease in extractives content did not influence the properties of water absorption, modulus of rupture (MOR) and modulus of elasticity (MOE). The increase in lignin content resulted in increase for apparent porosity and decrease of the toughness in reinforced fiber-cement produced with fibers treated at 200 and 230 °C. The application of the thermal treatment for the fibers did not show improvement in fiber-cement in the evaluated conditions. It is recommended to evaluate other properties of the fiber-cement reinforced with the mentioned treated fibers, such as natural and laboratorial weathering. MenosThis study proposes to evaluate the effect of the heat treatment in commercial eucalyptus fibers (produced by thermo-mechanical process) on the physical-mechanical properties of extruded fiber-cements composites. The fibers were treated with different temperatures of heat treatment (140, 170, 200 and 230 °C) for 60 min in a “Macro-ATG” oven. The chemical and morphological characteristics of the natural fibers were evaluated before and after the thermal treatment. The cementitious paste was composed by 67.9% cement, 29.1% limestone and 3% eucalyptus fibers. Hydroxypropylmethylcellulose (HPMC) and polyether carboxylic acid (ADVA 175) were added to the cement paste both in 1% (based on the cement mass) to facilitate the extrusion process. The thermal treatments at 200 and 230 °C were efficient in reducing the extractives content. On the other hand, a decrease in length, diameter and lumen size of the fibers has occurred. The decrease in extractives content did not influence the properties of water absorption, modulus of rupture (MOR) and modulus of elasticity (MOE). The increase in lignin content resulted in increase for apparent porosity and decrease of the toughness in reinforced fiber-cement produced with fibers treated at 200 and 230 °C. The application of the thermal treatment for the fibers did not show improvement in fiber-cement in the evaluated conditions. It is recommended to evaluate other properties of the fiber-cement reinforced with the mentioned treated fibers, s... Mostrar Tudo |
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Palavras-Chave: |
Cementitious composites; Chemical characterization; Extruded process; Morphological characterization. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02534naa a2200313 a 4500
001 2124283
005 2022-08-16
008 2020 bl uuuu u00u1 u #d
022 $a2214-7853
024 7 $ahttps://doi.org/10.1016/j.matpr.2020.04.764$2DOI
100 1 $aSILVA, D. W.
245 $aInfluence of thermal treatment of eucalyptus fibers on the physical-mechanical properties of extruded fiber-cement composites.$h[electronic resource]
260 $c2020
300 $aS348-S352
520 $aThis study proposes to evaluate the effect of the heat treatment in commercial eucalyptus fibers (produced by thermo-mechanical process) on the physical-mechanical properties of extruded fiber-cements composites. The fibers were treated with different temperatures of heat treatment (140, 170, 200 and 230 °C) for 60 min in a “Macro-ATG” oven. The chemical and morphological characteristics of the natural fibers were evaluated before and after the thermal treatment. The cementitious paste was composed by 67.9% cement, 29.1% limestone and 3% eucalyptus fibers. Hydroxypropylmethylcellulose (HPMC) and polyether carboxylic acid (ADVA 175) were added to the cement paste both in 1% (based on the cement mass) to facilitate the extrusion process. The thermal treatments at 200 and 230 °C were efficient in reducing the extractives content. On the other hand, a decrease in length, diameter and lumen size of the fibers has occurred. The decrease in extractives content did not influence the properties of water absorption, modulus of rupture (MOR) and modulus of elasticity (MOE). The increase in lignin content resulted in increase for apparent porosity and decrease of the toughness in reinforced fiber-cement produced with fibers treated at 200 and 230 °C. The application of the thermal treatment for the fibers did not show improvement in fiber-cement in the evaluated conditions. It is recommended to evaluate other properties of the fiber-cement reinforced with the mentioned treated fibers, such as natural and laboratorial weathering.
653 $aCementitious composites
653 $aChemical characterization
653 $aExtruded process
653 $aMorphological characterization
700 1 $aSCATOLINO, M. V.
700 1 $aPEREIRA, T. G. T.
700 1 $aVILELA, A. P.
700 1 $aEUGENIO, T. M. C.
700 1 $aMARTINS, M. A.
700 1 $aMENDES, R. F.
700 1 $aBUFALINO, L.
700 1 $aTONOLI, G. H. D.
700 1 $aMENDES, L. M.
773 $tMaterials Today: Proceedings$gv. 31, 2020.
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