| Journal: | Anais da Academia Brasileira de Ciencias |
| Database: | PERIÓDICA |
| System number: | 000329534 |
| ISSN: | 0001-3765 |
| Authors: | Calonego, Fred W1 Severo, Elias Taylor Durgante1 Cunha, Antonio R1 Gaia, Daiane C1 |
| Institutions: | 1Universidade Estadual Paulista "Julio de Mesquita Filho", Faculdade de Ciencias Agronomicas, Botucatu, Sao Paulo. Brasil |
| Year: | 2010 |
| Season: | Sep |
| Volumen: | 82 |
| Number: | 3 |
| Pages: | 791-797 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | The Eucalyptus grandis logs temperatures were determined and correlated with the board's cracks during steaming. Thermocouples were inserted in the logs center, registering their temperatures during steaming at 90"C. The logs were sawed and the board's cracks measured. It was concluded that: (1) the logistic S-shaped curve explains the logs temperature variation; (2) the logs with diameter of 20 to <25, 25 to <30 and 30 to <35 cm presented, respectively, 84.2"C, 73.1"C and 45.8"C in the steaming; and (3) the cracks lengths significantly decreased in logs that reached the glass transition temperature |
| Portuguese abstract | As temperaturas em toras de Eucalyptus grandis, durante a vaporização, foram determinadas e correlacionadas com as rachaduras das tábuas. Nos centros das toras foram inseridos termopares e registradas suas temperaturas durante a vaporização à 90"C. As toras foram desdobradas e as rachaduras das tábuas mensuradas. Concluiu-se que: (1) o modelo estatístico sigmoidal logístico explica a variação da temperatura nas toras; (2) as toras com 20 a <25, 25 a <30 e 30 a <35 cm de diâmetro apresentaram, respectivamente, 84,2"C, 73,1"C e 45,8"C ao final da vaporização; e (3) as rachaduras foramsignificativamente menores nas toras que atingiram a temperatura de transição vítrea |
| Disciplines: | Física y astronomía, Agrociencias |
| Keyword: | Física, Silvicultura, Fisicoquímica y química teórica, Eucalyptus grandis, Temperatura, Transición vítrea |
| Keyword: | Physics and astronomy, Agricultural sciences, Physics, Silviculture, Physical and theoretical chemistry, Eucalyptus grandis, Temperature, Glass transition |
| Full text: | Texto completo (Ver HTML) |
