Cellulose Eucalyptus
Mostrando 1-12 de 56 artigos, teses e dissertações.
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1. MODELAGEM DA EXPANSÃO DO REFLORESTAMENTO COM EUCALIPTO E EFEITOS NA ESTRUTURA DA PAISAGEM
Resumo Neste artigo trabalhamos uma metodologia combinada de sensoriamento remoto, modelagem ambiental e ecologia da paisagem para análise dos impactos da expansão do reflorestamento com eucalipto na estrutura da paisagem. O uso combinado dessas técnicas possibilitou a simulação de cenários futuros, utilizando-os não apenas como uma ferramenta de aná
Mercator (Fortaleza). Publicado em: 09/12/2019
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2. Different Types of Lignocellulosic Materials for Energy Generation in the Ceramic Industry
ABSTRACT This work aims at the physicochemical characterization of four species: Eucalyptus sp, Pinus sp, Citrus sinensis and Hevea brasiliensis for use in ceramic furnace. Immediate analysis, chemical analyses were carried out (total extractives, Klason lignin, holocellulose and alpha-cellulose content). Results were applied to ANOVA and Tukey for statistic
Floresta Ambient.. Publicado em: 03/10/2019
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3. Do the Growing Conditions of Trees Influence the Wood Properties?
ABSTRACT Currently, there is a little and sparse information about how the growing conditions influence the spatial variation of wood along the stem. Thus, the aim of this study was to compile the knowledge from literature in a manuscript for better understanding to what extent the growing conditions influence the spatial variation of wood properties in Euca
Floresta Ambient.. Publicado em: 16/09/2019
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4. First record of Thaumastocoris peregrinus (Hemiptera, Thaumastocoridae) in Pará state, Brazil
RESUMO Thaumastocoris peregrinus (Hemiptera, Thaumastocoridae) é uma praga fitófaga de plantios de eucalipto introduzida no Brasil em 2008. A espécie expandiu-se rapidamente devido à sua capacidade adaptativa a diferentes condições climáticas. O eucalipto vem se expandindo na Amazônia brasileira desde a década de 1980, sendo usado em sistemas silvip
Acta Amaz.. Publicado em: 12/08/2019
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5. The distribution of Lignin and Xylan in the Inner and Surface Layers of the Fiber from Eucalyptus Kraft Pulp and its Effects on Oxygen Delignification
The chemical structure and composition of lignin and hemicellulose, as well as the distribution between inner and outer layers of fiber, can adversely affect bleaching operations or fiber-fiber bond on pulp and, consequently the papermaking process. Herein, we have implemented the fractionation and mechanical peeling techniques in order to identify the fines
Mat. Res.. Publicado em: 22/06/2017
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6. Exploratory Analysis of the Distribution of Lignin and Cellulose in Woods by Raman Imaging and Chemometrics
The determinations of cellulose and lignin are important in wood analysis from both perspectives: chemistry composition, commercial and industrial application of woods. In this context, Raman image spectroscopy was applied in the determination of cellulose and lignin distribution in wood surfaces of Swietenia macrophylla King (Mahogany) and Eucalyptus hybrid
J. Braz. Chem. Soc.. Publicado em: 2015-06
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7. TPS Nanocomposite reinforced with MFC by melting process
Bionanocomposites of thermoplastic starch (TPS) reinforced with microfibrilated cellulose (MFC) were prepared by melt processing. MFC was prepared from eucalyptus wood pulp by a process combining cryogenic milling in high shear mixers, chemical treatment with sodium hydroxide and ultrasound treatment. The never dried MFC was then dispersed in native starch a
Mat. Res.. Publicado em: 27/06/2014
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8. Qualidade da madeira de Eucalyptus para a produção de carvão vegetal / Wood quality of Eucalyptus for charcoal production
The present study aimed to determine the properties of wood and charcoal from different clones of Eucalyptus spp. Six clones at 7.5 years old were evaluated and the samples were from a clonal test of a forestry company, located in the city of Lassance, Minas Gerais, Brazil. For wood, basic density, heart/sapwood ratio, morphological analysis of fibers and po
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/02/2012
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9. Materials produced from plant biomass: part II: evaluation of crystallinity and degradation kinetics of cellulose
In this study Eucalyptus grandis (CEG) and Pinus taeda (CPT) cellulose fibers obtained from kraft and sulfite pulping process, respectively, were characterized using Fourier transform infrared (FTIR) spectroscopy and thermogravimetry (TGA). The degradation kinetic parameters were determined by TGA using Coats and Redfern method. FTIR results showed that CPT
Materials Research. Publicado em: 22/05/2012
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10. Capacidade de deterioração de cepas de Eucalyptus spp. por fungos xilófagos / Capacity of deterioration of stumps of Eucalyptus spp. by xylophagous fungi
On the reform of the forest stand, after the cutting of trees, the remaining strains of Eucalyptus spp. must be removed. The natural degradation of stumps of eucalypts after clear cutting is slow. The mechanical destock raises the cost of production, involves machinery traffic on the ground favoring soil compaction and hindering the growth and distribution o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/12/2011
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11. Solventes verdes para biopolímeros: síntese e aplicação de líquidos iônicos na derivatização de celulose / Green solvents for biopolymers: synthesis of ionic liquids and their use in derivatization of cellulose
The work reported has the target of studying the acylation of cellulose under homogeneous reaction conditions. Imidazolium-based ionic Liquids (ILs) were employed as solvents, and the reaction was assisted by a microwave. These following processes have been studied: Optimization of the synthesis of ILs; ii) Effects of the structure of ILs on the dissolution
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/10/2011
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12. Determinação de constituintes químicos em madeira de eucalipto por Pi-CG/EM e calibração multivariada: comparação entre redes neurais artificiais e máquinas de vetor suporte
Multivariate models were developed using Artificial Neural Network (ANN) and Least Square - Support Vector Machines (LS-SVM) for estimating lignin siringyl/guaiacyl ratio and the contents of cellulose, hemicelluloses and lignin in eucalyptus wood by pyrolysis associated to gaseous chromatography and mass spectrometry (Py-GC/MS). The results obtained by two c
Química Nova. Publicado em: 2011