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| Vivian, Magnos Alan; Santini, Elio José; Modes, Karina Soares; Carvalho, Douglas Edson; Morais, Weslley Wilker Corrêa; Souza, Joel Telles de; Susin, Felipe. |
| O presente estudo objetivou avaliar o uso da constante elástica dinâmica obtida no ensaio não destrutivo, como parâmetro para estimativa das propriedades mecânicas de rigidez e resistência da madeira de Eucalyptus grandis. Para isto, utilizou-se um emissor de ondas ultrassônicas, o qual teve sua sensibilidade avaliada através da comparação com os valores obtidos no ensaio destrutivo de flexão estática. Os resultados evidenciam que a constante elástica dinâmica pode ser utilizada para inferência não destrutiva da rigidez e resistência da madeira de Eucalyptus grandis, entretanto com ressalvas, pois os ajustes observados foram relativamente baixos, com R²aj. de 0,25 e 0,39, respectivamente. doi: 10.4336/2012.pfb.32.69.109 |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ensaio não destrutivo; Módulo de elasticidade; Módulo de ruptura Non-destructive testing; Modulus of elasticity; Modulus of rupture. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/272 |
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| Juizo, Claudio Gumane Francisco; Loiola, Pedro Lício; Zen, Linéia Roberta; Marchesan, Raquel; Carvalho, Douglas Edson; Bila, Narcísio Fernando; Egas, Andrade Fernando; Rocha, Márcio Pereira da; Klitzke, Ricardo Jorge. |
| This study aimed to evaluate wood physical properties of Pinus patula, aged 38, from a forest stand located in Machipanda, central region of Mozambique. Determination of physical properties, such as basic specific gravity, shrinkage, and moisture content of wood in the pith-bark followed the recommendations of the Panamerican Standard - COPANT. Results showed statistically significant differences at significance level of 5%, in the radial direction for the shrinkage coefficient in the pith-bark. Radial and tangential shrinkage values were 6.06 and 8.80% in juvenile wood and 6.18 and 8.65% in adult wood, respectively, with anisotropy coefficient of 1.43 for juvenile wood and 2.44 for adult wood. Pinus patula growing in Inhamacari forest shows stable wood... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Retratibility; Humidity; Specific gravity; Wood quality Recursos Florestais Engenharia Florestal; Tecnologia da madeira; Retratibilidade; Umidade; Massa específica; Qualidade da madeira. |
| Ano: 2015 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/771 |
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| Talgatti, Maiara; Susin, Felipe; Carvalho, Douglas Edson; Santini, Elio José. |
| This study aimed to verify the basic density influence in dynamic bending trails of Hovenia dulcis Thunb wood. In order to do so, 34 samples of heart wood were used, with the following dimensions: 30 x 2 x2 cm (longitudinal, radial and tangential) respectively, according to the Brazilian standard, NBR 7190 (1997). The samples were evaluated for their basic density for the rate between the weight in 12% of moisture and its respective volume and posteriorly, it was separated in two groups: the first with specific weight between 0,55 and 0,64 g/cm³ and the second one between 0,65 and 0,75, aiming the comparison between the treatments. The wood resistance for the dynamic bending was estimated, using the Charpy’s impact test, in the radial direction.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Propriedade mecânica; Qualidade da madeira; Resistência ao impacto.. |
| Ano: 2017 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/14191 |
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| Freitas, Danilo Leão de; Carvalho, Douglas Edson; Beltrame, Rafael; Santos, Gleison Augusto dos; Gatto, Darci Alberto; Haselein, Clovis Roberto. |
| The study of the dimensional stability of the wood is essential for industrial use, both in construction and the manufacture of furniture. The dimensional instability of the wood is a relevant problem that occurs during its beneficiation, as a consequence of the change in moisture content, and that shall be considered to determine the best end use for the same. From the exposed, the objective of this study was to evaluate the dimensional variations of maximum volumetric and linear, beyond the stability of wood three clones of Eucalyptus spp. For so much, were used three different hybrids of Eucalyptus: Eucalyptus saligna x Eucalyptus saligna, Eucalyptus urophylla x Eucalyptus grandis e Eucalyptus urophylla x Eucalyptus globulus. The preparation of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anisotropia de contração; Qualidade da madeira; Retratibilidade.. |
| Ano: 2016 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/12999 |
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| Martins, Ana Paula Marques; Carvalho, Douglas Edson; Schmidt, Luciane Naimeke; Gorenstein, Maurício Romero; Cysneiros, Vinícius Costa. |
| The objective of this research was to evaluate the performance of different methods for estimating total volume for Corymbia citriodora (Hook.) K.D. Hill & L.A.S. Johnson, with 17 years old, located in west of São Paulo State, Brazil. The compared methods were the volumetric equation from Schumacher and Hall, the two diameters method and the artificial form factor. Comparison of methodologies was made by analysis of variance (ANOVA) and the F value to detect significant differences between treatments, in which each method was considered as a treatment, and the volume obtained by Smalian was considered the control treatment. Test of Tukey was applied if necessary. For the method of the two diameters, the portion of the stem that propitiated the most... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cubagem por Smalian; Equação volumétrica; Fator de forma; Método dos dois diâmetros.. |
| Ano: 2016 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/13203 |
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| Martins, Ana Paula Marques; Francesci, Fernando; Gallo, Joseane Cristina; Vuaden, Elisabete; Padoin Weber, Veridiana; Carvalho, Douglas Edson. |
| This study aims to model the hypsometric relation to Pinus elliottii Engelm in the city of Dois Vizinhos, Paraná State, Brazil, and to investigate the difference of the relationship between the different sociological positions. For this study was conducted a census on a plot of 0.25 ha located on the Campus of the Federal Technological University of Paraná, being measured diameter at breast height (dbh), total height (h) and sociological position of three strata: PS1 - dominant trees; PS2 - codominant trees; and PS3 - controlled or suppressed trees. Seven models of hypsometric relation determined by STEPWISE procedure were adjusted. The parameters used for selection of the models were the adjusted coefficient of determination (R2aj.), coefficient of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Competição; Modelos hipsométricos; Povoamentos florestais. |
| Ano: 2016 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/11254 |
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