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| Christoforo,André L.; Arroyo,Felipe N.; Silva,Diogo A. Lopes; Panzera,Tulio H.; Lahr,Francisco A. R.. |
| ABSTRACT: Wood is a material that for years has been used by man for a variety of purposes, particularly in rural and civil constructions and furniture industry. The possibility of shortages of some wood species, the characterization of other unfamiliar species is an alternative source for use in civil and rural construction. This study aimed to determine, with the aid of Brazilian standard NBR 7190, physical and mechanical properties of Castelo (Calycophyllum multiflorum) wood specie. Twelve determinations were obtained by property, totaling 204 experimental values. In the characterization of wood, regression models were used to estimate the values of timber strength and stiffness as a function of apparent density, being density the physical property more... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calycophyllum multiflorum; Physical-mechanical properties; Hardwood; Regression model. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000400637 |
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| Christoforo,André L.; Panzera,Tulio H.; Lahr,Francisco A. R.. |
| ABSTRACT According to the ABNT NBR 7190: 1997 standard, tensile strength of wood samples shall be defined as the ratio between the ultimate strength from a stress test and the specimen cross-sectional area (350 mm2). However, due to the complex wood anatomy and experimental difficulties, the fractured surface in tested samples are not perpendicular to the loading direction; therefore, such fractured surface becomes larger than the sample cross section, overestimating tensile strength by this method. Using an alternative approach, we aimed to determine the approximate fracture surface of wood specimens subjected to tensile test. For this purpose, we used the least square method to estimate tensile strength of four hardwood species, which were equally... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tensile Strength; Wood; Hardwood; Least Square Method. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000400533 |
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| Soares,Sabrina Delgado; Bandeira,Ludmila Ferreira; Ribeiro,Stela Barros; Telles,Mariana Pires de Campos; Silva,João Augusto da; Borges,Canrobert Tormin; Coelho,Alexandre Siqueira Guedes; Novaes,Evandro. |
| Abstract Given its high-valued wood, the African mahogany (Khaya grandifoliola) has been envisaged as a renewable source of tropical hardwoods in Brazil. However, there are concerns about the hypothesized low diversity among the few K. grandifoliola germplasm sources introduced in the country. Using eight microsatellite markers, we evaluated the genetic diversity and divergence among 53 superior trees selected from three provenances of K. grandifoliola located in the state of Para. These populations are among the oldest plantations (>15 years) in Brazil and, therefore, the country's main seed sources. The average number of alleles per locus was 5.9, expected heterozygosity was moderate (^=0.56) and lower than the high observed heterozygosity (HO=0.74).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microsatellites; SSR; Genetic structure; Genetic divergence; Hardwood. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400301 |
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