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1797. | | PINHEIRO, K. A. O.; RUSCHEL, A. R.; OLIVEIRA, F. de A.; CARNEIRO, F. da S.; D'ARACE, L. M. B.; SILVA, F. L. da; FRAZÃO, A. da S. Tratamentos silviculturais e volume de madeira em uma área experimental de floresta nativa na Jari, Amapá. Revista Ibero Americana de Ciências Ambientais, v. 10, n. 6, p. 50-66, 2019. Biblioteca(s): Embrapa Amazônia Oriental. |
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Registros recuperados : 5.292 | |
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Registro Completo
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
03/07/2003 |
Data da última atualização: |
17/03/2016 |
Autoria: |
MACEDO, A.; VAZ, C. M. P.; PEREIRA, J. C. D.; NAIME, J. M.; CRUVINEL, P. E.; CRESTANA, S. |
Afiliação: |
Embrapa Instrumentação Agropecuária, São Carlos, SP. |
Título: |
Wood density determination by X-and gamma-ray tomography. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
Holzforschung, Berlin, v. 56, p. 535-540, 2002. |
Idioma: |
Inglês |
Conteúdo: |
Wood density measurements is related to several factors that influence wood quality. In this paper, a CT image calibration procedure which allows image quantification in terms of dry bulk density is presented for three different X-and gamma-ray energies (28.3, and 59.5, and 662.0 keV). The mass attenuation coefficients measured for a set of eight wood species did not vary significantly, allowing a single calibration for determination of bulk density of air-dried wood samples at each energy. The equation for bulk density calibration obtained was validated using a second set of twelve wood species. Comparison of bulk density determined by CT images, using the calibration procedure proposed, with values obtained by gravimetric methods, presneted a very good linear correlation coefficient (R2=0.94). The main advantage of CT imaging over conventional techniques for wood bulk density determination is that it allows detection and quantification of heterogeneities and internal defects. At the sub-millimetric spatial resolution level, it is possible to identify morphological and structural aspects of wood samples. |
Palavras-Chave: |
Conteúdo; Densidade; Imagem tomográfica; Mass attenuation coefficient; Tomografia computadorizada; Wood water content. |
Thesagro: |
Água; Madeira. |
Thesaurus NAL: |
computed tomography; wood density. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01923naa a2200301 a 4500 001 1024805 005 2016-03-17 008 2002 bl --- 0-- u #d 100 1 $aMACEDO, A. 245 $aWood density determination by X-and gamma-ray tomography. 260 $c2002 520 $aWood density measurements is related to several factors that influence wood quality. In this paper, a CT image calibration procedure which allows image quantification in terms of dry bulk density is presented for three different X-and gamma-ray energies (28.3, and 59.5, and 662.0 keV). The mass attenuation coefficients measured for a set of eight wood species did not vary significantly, allowing a single calibration for determination of bulk density of air-dried wood samples at each energy. The equation for bulk density calibration obtained was validated using a second set of twelve wood species. Comparison of bulk density determined by CT images, using the calibration procedure proposed, with values obtained by gravimetric methods, presneted a very good linear correlation coefficient (R2=0.94). The main advantage of CT imaging over conventional techniques for wood bulk density determination is that it allows detection and quantification of heterogeneities and internal defects. At the sub-millimetric spatial resolution level, it is possible to identify morphological and structural aspects of wood samples. 650 $acomputed tomography 650 $awood density 650 $aÁgua 650 $aMadeira 653 $aConteúdo 653 $aDensidade 653 $aImagem tomográfica 653 $aMass attenuation coefficient 653 $aTomografia computadorizada 653 $aWood water content 700 1 $aVAZ, C. M. P. 700 1 $aPEREIRA, J. C. D. 700 1 $aNAIME, J. M. 700 1 $aCRUVINEL, P. E. 700 1 $aCRESTANA, S. 773 $tHolzforschung, Berlin$gv. 56, p. 535-540, 2002.
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