Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 45 for “"Extractives"”.
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Extractives from Sitka spruce
The term extractives defines chemical compounds of different classes that can be extracted from wood or bark by means of polar or non-polar solvents. Extractives are derived mostly from the metabolic processes of the tree, particularly the sapwood to heartwood transformation. The first objective of …
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Wood extractives in hemicellulose stabilized emulsions
… This study aims at evaluating the role of wood extractives present in hemicellulose isolates for emulsion stabilization. This study investigated the characterisation of wood extractives in isolated hemicelluloses and evaluated the role of wood extractives in stabilization of hemicelluloses …
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China and transparency norm development in global extractives governance
… appear to take a more active role in global extractives governance. This dissertation examines whether China is a norm-taker or a norm-maker in transparency norm development processes of global extractives governance to understand this new phenomenon. In addition, this research seeks to …
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Extractives of Douglas-fir and Their Impacts for Biofuel Saccharification
… The specific focus of this research is on the “extractives” class of molecules in forestry residues. Extractives make up 5% to 25% of the dry weight for different tissues of Douglas-fir, but are overlooked in most biofuel studies. These molecules have been well studied in pulp and paper industry …
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Analysis of polymeric extractives of Western Juniper (Juniperus occidentalis) heartwood
Extractives of Western Juniper (Juniperus occidentalis) have been isolated and separated by chromatographic means. Since this species is durable, bioactivity of several fractions has been determined. The bioactivity has been determined by the brine shrimp lethal bioassay. Less polar compounds with …
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The effects of condensed fermented corn extractives on the pelleting process
Digitized by Kansas State University Libraries
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The effects of condensed fermented corn extractives on the pelleting process
Digitized by Kansas State University Libraries
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The outlook on the extractives upstream investment in South Africa: the environmental governance issue
… in on the environmental governance of the extractives sector. Environmental governance in South Africa was fragmented. The fragmentation occurred in policies, institutions and, ultimately, governance. The consequences of this fragmentation were regulatory duplication and inconsistencies …
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Relationships Between Hybrid Poplar Tree Extractives and Ground Water Contamination at a Phytoremediation Site
In 1997, a phytoremediation program began at a creosote-contaminated former railroad tie yard in Oneida, Tennessee with the planting of over 1000 hybrid poplar trees onsite. Creosote, a mixture of hazardous chemicals composed of 85% polycyclic aromatic hydrocarbons (PAH) had entered the site soil …
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High-performance liquid chromatographic methods for quantitative assessment of degradation products and extractives in pretreated lignocellulose.
Long-term economic, national security, and environmental concerns have motivated research into renewable fuels from lignocellulosic biomass. Among energy alternatives, biomass-derived ethanol represents one of the more promising commodities for long-term sustainability of transportation fuels. …
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Illicit Financial Flows in Zambia's Integrated Economy: Analysing the effects of illegal taxation practices in the extractives industry on value addition
Mining is an important sector of Zambia's economy. Using the Constitution, legislative measures, and other policy pronouncements, efforts are being made by the Zambian government to maximise opportunities for diversification and value addition from mining to other sectors of the economy. …
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Fate and effects of pulp mill effluent solids in the soil environment
… the effects of resin extractive compounds. Resin extractives have been shown to be recalcitrant and to accumulate in anaerobic sediments. It is not known to what extent resin extractives are bioavailable or degradable in land applied Pulp mill effluent solids (PMES), or their potential to …
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Analysis of wood pulp extracts utilizing gas chromatography-mass spectroscopy
… well as quantitatively based on the percent of extractives obtained. For all the pulps studied, the percent extractives of water > ethyl acetate > cyclohexane. The CTMP extracts exhibited many more components as compared to BKP extracts for all the extractions solvents. The presence of trace …
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Local content requirements in the South African extractives sector: Do South Africa's local content requirements for the mineral and mining sector promote foreign direct investment?
The South African Government has an interest in ensuring that South Africa derives benefit from the exploitation of its natural resources. In the South African mineral and mining industry, this interest extends to the proceeds acquired from participation therein. Participation in the mineral and …
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Mechanisms of biogenic formaldehyde generation in wood
… other two species. It was suggested that pine extractives might catalyze CH₂O generation, perhaps in lignin. Pinus virginiana wood was heated (200°C, 10 or 60 min) while dry or after aqueous/acid or base pretreatment in order to reveal mechanisms of formaldehyde (CH₂O) generation. Among wood …
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Modeling longleaf pine (Pinus palustris Mill) wood properties using near infrared spectroscopy
… between strength and stiffness. Klason lignin, extractives, and microfiber angle (MFA) were also measured throughout the tree. I found extractives, lignin, and MFA to decrease from the pith outward regardless of height. A theoretical model was built attempting to explain how lignin content and …
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THE NATURE OF BOND FORMATION AND FAILURE IN WOOD-ADHESIVE SYSTEMS
… interact chemically with mainly lignins and extractives and to a lesser extent with cellulose. These interactions are thought to be covalent links as only this type of bond will account for the spectral changes noted. The dopant compounds used were urea, dimetol urea, methylene diurea, …
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Characterizing the chemistry of yellow-poplar surfaces exposed to different surface energy environments using DCA, DSC, and XPS
… mobility that enables increased diffusion of extractives to the surface and reorientation of polymer molecules and/or functional groups. Above the Tg, the wood with aluminum treatment is greater in surface energy than the control and other surface treatments. The surface energy obtained from …
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Comparative Analysis of Inactivated Wood Surfaces
… high concentration of non-polar wood components (extractives/VOCs) on the wood surface, which modified the wood surface from hydrophilic to more hydrophobic. Wettability was directly related to the O/C ratio and inversely related to the C1/C2 ratio. Contact angle decreased with time and increased …
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Aging of whiskey spirits in barrels of non-traditional volume
… to outside air. The barrel wood itself provides extractives derived from structural polymers which have been degraded during barrel construction. These extractives have a cumulative effect on the sensory characteristics of the aging spirit. The traditional barrel for the aging of spirits ranges …
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