Extractive Of The Wood
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. INFLUENCE OF TIME AND HEAT TREATMENT TEMPERATURE ON PERMEABILITY OF Eucalyptus grandis WOOD
RESUMO Devido ao fato de a madeira in natura possuir características de permeabilidade inadequadas para algumas aplicações, diversas técnicas de processamento foram desenvolvidas, como tratamentos hidrotérmicos e congelamento, que visam melhorar essas propriedades. O objetivo deste estudo foi analisar os efeitos do tempo e da temperatura de tratamento n
Rev. Árvore. Publicado em: 07/10/2019
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2. THERMAL PROFILE OF WOOD SPECIES FROM THE BRAZILIAN SEMI-ARID REGION SUBMITTED TO PYROLYSIS
ABSTRACT The objective of this study was to evaluate the thermal decomposition profile of 10 wood species from the semi-arid region of Brazil using thermogravimetric analysis (TGA) to investigate their potential as biomass energy sources. First, flash carbonization was carried out in a muffle furnace, in which wood samples were heated to a maximum temperatur
CERNE. Publicado em: 20/05/2019
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3. Natural decomposition of hornbeam wood decayed by the white rot fungus Trametes versicolor
ABSTRACT The impacts of white-rot fungi on altering wood chemistry have been studied mostly in vitro. However, in vivo approaches may enable better assessment of the nature of interactions between saprotrophic fungi and host tree in nature. Hence, decayed and sound wood samples were collected from a naturally infected tree (Carpinus betulus L.). Fruiting bod
An. Acad. Bras. Ciênc.. Publicado em: 07/12/2017
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4. Effect of wood particle treatment on the properties of gypsum plaster pastes and composites
ABSTRACT In this work the performance of gypsum plaster and wood particle in pastes and composites was investigated. Wood particles of fineness 0.42 mm and 1.20 mm were employed. Natural wood particles and the treated ones in cold or hot water (80 °C) were performed. The effects of the extractives solutions from the treatments applied to the wood particles
Matéria (Rio J.). Publicado em: 2016-12
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5. Materials produced from plant biomass: Part I: evaluation of thermal stability and pyrolysis of wood
This paper compares the thermal stability of the sawdust of different wood species, an important factor in producing reinforced polymers. The compositions of two wood species, Pinus taeda and Eucalyptus grandis, were determined to evaluate the influence of the main wood components on the thermal stability of this material. The two species were submitted to t
Materials Research. Publicado em: 2010-09
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6. Potential of Australian Cedar wood (Toona ciliata M. Roem var. australis) for the manufacturing of greater added value products / Potencial da madeira de Cedro Australiano (Toona ciliata M. Roem var. australis) na manufatura de produtos de maior valor agregado
The objective of this work was to study the potential of 4 and 18 years old wood of Australian Cedar (Toona ciliata) for the production of plywood, OSB, particleboard and cement-wood panels. The woods from four different places were compared: Campo Belo, Cana Verde, Santo Antônio do Amparo and Marechal Floriano. Plywood panels containing 5 veneers were prod
Publicado em: 2009
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7. Modelagem da dinâmica de crescimento de uma Floresta Ombrófila aerta do estado de Rondônia / Modelling of growth dynamics of tropical rain forest of State of Rondonia, Brazil.
A model of the growth dynamics of forests was developed applying Bertalanffy growth model (BGM) y=a[(1ebt)c] for individual trees. Based on linearized relationship with diameter and height equation LnH=b0+LnD and volume equation V=b0Db1Hb2 mutually compatible equations for diameter, basal area, height and volume were generated, adjusting parameters a and c o
Publicado em: 2009
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8. Effect of age of the wood of eucalyptus in its chemical and pulpability, and bleachability and properties of the pulp / Efeito da idade da madeira de eucalipto na sua química e polpabilidade, e branqueabilidade e propriedades físicas da polpa
The concern about the quality of the wood that enters a cellulose factory has been focused on many studies, once the productive process and final product are under great influence of the original raw material. Considering the demand for younger trees, the effect of the age of the wood in the chemical constitution and the variables of the process, as well as
Publicado em: 2008
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9. Caracterização química do "pitch" em indústria de celulose e papel de Eucalyptus
The chemical analysis of the acetone, chloroform, toluene and methanol extracts of a pitch sample was carried out by IR and GC-MS, leading to the identification of sixty nine compounds, including fatty acids, alcohols and hydrocarbons. Analysis of the acetone extractive of a eucalyptus wood used in Brazil for pulp production was also carried out, resulting i
Química Nova. Publicado em: 2006-06
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10. Caracterização de ligninas de Eucalyptus spp. pela técnica de pirólise associada à cromatografia gasosa e à espectrometria de massas / Characterizing the lignins of Eucalyptus spp. by the pyrolysis technique associated to both gas chromatography and mass spectrometry
Lignin is one of the main wood components as well as the cellulose and hemicellulose. It is known that the composition of lignin relative to the amounts of unit syringyl (S) and guaiacyl (G) can affect the efficiency of the kraft pulping. Thus, this work was carried out to develop a methodology for the determination of the S/G relationship in the Eucalyptus
Publicado em: 2006
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11. Influence of termotreatment in the chemical composition of the wood of amburana (Amburana cearensis), bálsamo (Myroxylon balsamum) and oak (Quercus sp.) and their impact in the aroma of a cachaça´s solution model / Influência do termotratamento na composição química da madeira de amburana (Amburana cearensis), bálsamo (Myroxylon balsamum) e carvalho (Quercus sp.) e o impacto no aroma de uma solução modelo de cachaça
Neste trabalho foi avaliado o efeito do termotratamento na composição química de madeiras utilizadas na confecção de tonéis e o impacto no aroma de uma solução modelo de cachaça, que apresentasse características físico-químicas desta bebida. As madeiras foram avaliadas quanto à composição química em suas formas original e termotratada. Extrat
Publicado em: 2006
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12. Artesanato de caixeta em São Sebastião - SP. / The handcraft with "caixeta" in São Paulo -Sebastião
The handcraft with "caixeta" - Tabebuia Cassinoides (Lam) DC - that exists in the city of São Sebastião, in São Paulo, Brazil, was created by the local craftsmen during the decade of the eighties as a result from the tourism started in the region, from the knowledge of the wood carving techniques of the "caiçaras" craftsmen and from the availability of t
Publicado em: 2002