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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
27/05/2021 |
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Data da última atualização: |
01/06/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
LIMA, G. G. de; BARBOSA, R. R. C.; SANTOS, M. P. de A.; CHEE, B. S.; MAGALHAES, W. L. E.; DEVINE, D. M.; NUGENT, M. J. D. |
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Afiliação: |
GABRIEL GOETTEN DE LIMA, Universidade Federal do Paraná; RÊYDILA RAYENNE CAMINHAS BARBOSA, Athlone Institute of Technology; MAYARA PAZIN DE ANDRADE SANTOS, Universidade Federal do ABC; COMERC ESCO e SOLAR; BOR SHIN CHEE, Department of Life & Physical Sciences in Athlone Institute of Technology; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; DECLAN M. DEVINE, Athlone Institute of Technology; MICHAEL J. D. NUGENT, Athlone Institute of Technology. |
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Título: |
Effect of unidirectional freezing using a thermal camera on polyvinyl (alcohol) for aligned porous cryogels. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Quantitative InfraRed Thermography Journal, v. 18, n. 3, p. 177-186, 2021. |
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DOI: |
https://doi.org/10.1080/17686733.2020.1732735 |
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Idioma: |
Português |
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Conteúdo: |
Unidirectional freeze casting for polymers and ceramics has been performed extensively; however, the mechanisms involved in unidirectional freezing are not thoroughly understood and therefore, in this study, polyvinyl (alcohol) hydrogels were freeze-thawed by unidirectional freezing and the resultant freezing profile was investigated using thermal imagery to comprehend the physical mechanism involved in the production of these aligned cryogels. The approach used follows a slight variation from what is currently used in literature, by enclosing the mould with insulating materials and leaving one side with a metal encasing for a fast freezing flow from the direction of the desired aligned of the structure. This method was cost-effective and simple; however, it was able to induce unidirectional freezing resulting in two distinct structures. These structures exhibited a cellular region interspersed with a fibrous and porous morphology. The method developed without the need of a freeze-dryer was confirmed to produce a unidirectional freezing which can be used for future studies. |
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Palavras-Chave: |
Congelamento unidirecional; Freeze casting; Fundição por congelamento; Hidrogéis de polivinil (álcool); Polímeros; Polyvinyl (alcohol) cryogels; Unidirectional-freezing. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02064naa a2200289 a 4500
001 2132061
005 2021-06-01
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1080/17686733.2020.1732735$2DOI
100 1 $aLIMA, G. G. de
245 $aEffect of unidirectional freezing using a thermal camera on polyvinyl (alcohol) for aligned porous cryogels.$h[electronic resource]
260 $c2021
520 $aUnidirectional freeze casting for polymers and ceramics has been performed extensively; however, the mechanisms involved in unidirectional freezing are not thoroughly understood and therefore, in this study, polyvinyl (alcohol) hydrogels were freeze-thawed by unidirectional freezing and the resultant freezing profile was investigated using thermal imagery to comprehend the physical mechanism involved in the production of these aligned cryogels. The approach used follows a slight variation from what is currently used in literature, by enclosing the mould with insulating materials and leaving one side with a metal encasing for a fast freezing flow from the direction of the desired aligned of the structure. This method was cost-effective and simple; however, it was able to induce unidirectional freezing resulting in two distinct structures. These structures exhibited a cellular region interspersed with a fibrous and porous morphology. The method developed without the need of a freeze-dryer was confirmed to produce a unidirectional freezing which can be used for future studies.
653 $aCongelamento unidirecional
653 $aFreeze casting
653 $aFundição por congelamento
653 $aHidrogéis de polivinil (álcool)
653 $aPolímeros
653 $aPolyvinyl (alcohol) cryogels
653 $aUnidirectional-freezing
700 1 $aBARBOSA, R. R. C.
700 1 $aSANTOS, M. P. de A.
700 1 $aCHEE, B. S.
700 1 $aMAGALHAES, W. L. E.
700 1 $aDEVINE, D. M.
700 1 $aNUGENT, M. J. D.
773 $tQuantitative InfraRed Thermography Journal$gv. 18, n. 3, p. 177-186, 2021.
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Registro original: |
Embrapa Florestas (CNPF) |
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Biblioteca |
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Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
01/11/1994 |
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Data da última atualização: |
03/02/2024 |
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Tipo da produção científica: |
Folder/Folheto/Cartilha |
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Autoria: |
STRAUSS, J.; BARBOSA, M. M. T. L.; TEIXEIRA, S. M.; THOMAS, D.; GOMES JUNIOR, R. A. Q. |
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Afiliação: |
JOHN STRAUSS; MARIZA M. T. L. BARBOSA; SONIA MILAGRES TEIXEIRA, CNPAF; DUNCAN THOMAS; RAIMUNDO A. Q. GOMES JUNIOR. |
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Título: |
Modelling the use and adoption of technologies by upland rice and soybean farmers in Central-West Brazil. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
New Haven: Yale University, Economic Growth Center, 1989. |
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Páginas: |
23 p. |
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Série: |
(Discussion paper, 587). |
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Idioma: |
Inglês |
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Conteúdo: |
This paper explores reduced form determinants of the adoption of certain technologies by upland rice and soybean farmers in the central-west region of Brazil. We merge community level data on the availability and quality of publicly provided infrastructure, principally extension, to farm level data containing information on farmer human capital as well as land quantity and quality. By using conununity level measures of availability and quality of extension we avoid problems of endogeneity of farm level measures of extension use. We find positive impacts of farmer education on the diffusion process, in accordance with other studies. We also isolate effects of the quality of regional extension investment as measured by the average experience of technical extension staff. |
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Palavras-Chave: |
Centro-Oeste. |
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Thesagro: |
Adoção de Inovações; Arroz; Oryza Sativa; Soja; Tecnologia. |
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Thesaurus NAL: |
Brazil; Information technology; Innovation adoption; Rice; Soybeans. |
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Categoria do assunto: |
E Economia e Indústria Agrícola |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/197912/1/Modelling-the-Use-and-Adoption-of-Technologiesby-Upland-Rice-and.pdf
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Marc: |
LEADER 01674nam a2200313 a 4500
001 1197912
005 2024-02-03
008 1989 bl uuuu u0uu1 u #d
100 1 $aSTRAUSS, J.
245 $aModelling the use and adoption of technologies by upland rice and soybean farmers in Central-West Brazil.$h[electronic resource]
260 $aNew Haven: Yale University, Economic Growth Center$c1989
300 $a23 p.
490 $a(Discussion paper, 587).
520 $aThis paper explores reduced form determinants of the adoption of certain technologies by upland rice and soybean farmers in the central-west region of Brazil. We merge community level data on the availability and quality of publicly provided infrastructure, principally extension, to farm level data containing information on farmer human capital as well as land quantity and quality. By using conununity level measures of availability and quality of extension we avoid problems of endogeneity of farm level measures of extension use. We find positive impacts of farmer education on the diffusion process, in accordance with other studies. We also isolate effects of the quality of regional extension investment as measured by the average experience of technical extension staff.
650 $aBrazil
650 $aInformation technology
650 $aInnovation adoption
650 $aRice
650 $aSoybeans
650 $aAdoção de Inovações
650 $aArroz
650 $aOryza Sativa
650 $aSoja
650 $aTecnologia
653 $aCentro-Oeste
700 1 $aBARBOSA, M. M. T. L.
700 1 $aTEIXEIRA, S. M.
700 1 $aTHOMAS, D.
700 1 $aGOMES JUNIOR, R. A. Q.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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