منابع مشابه
The Chemical Composition of Wood
This chapter includes overall chemical composition of wood, methods of analysis, structure of hemicellulose components and degree of polymerization of carbohydrates. Tables of data are compiled for woods of several countries. Components include: cellulose (Cross and Bevan, holo-, and alpha-), lignin, pentosans, and ash. Solubilities in 1% sodium hydroxide, hot water, ethanol/ benzene, and ether...
متن کاملChemical extractives of the tropical wood
1 Wallaba (Eperua falcata) is a tropical wood which is known to have naturally low swelling 2 characteristics. Samples of wallaba heartwood were subjected to differential solvent 3 extraction. Wood pieces that were extracted with methanol experienced significantly higher 4 swelling after rehydration from oven dry to 96% relative humidity in comparison to non-5 extracted samples and samples extr...
متن کاملChemical Ecology of Wood-boring Insects
The roles and chemistry of pheromones that mediate reproductive behaviors of cerambycid beetles have received remarkably little attention, given the economic importance of many cerambycid species. Until recently, very few volatile sex pheromones and nonvolatile contact pheromones had been identified. However, that situation is changing rapidly, with the number of identified pheromones more than...
متن کاملNoise control in the wood processing industry
In general, noise levels were in the 90-100 dB range, regarded as very noisy. Few workplaces in New Zealand have such consistently high levels. Although the problem might seem insoluble, simple solutions at each stage could be identified. At the source of the noise, new designs of both band and circular saws can reduce the noise by up to 6 dB (a quarter of the noise). During sawmilling operatio...
متن کاملPhysical and chemical characterization of waste wood derived biochars.
Biochar, a solid byproduct generated during waste biomass pyrolysis or gasification in the absence (or near-absence) of oxygen, has recently garnered interest for both agricultural and environmental management purposes owing to its unique physicochemical properties. Favorable properties of biochar include its high surface area and porosity, and ability to adsorb a variety of compounds, includin...
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ژورنال
عنوان ژورنال: Journal of the Society of Materials Science, Japan
سال: 1967
ISSN: 1880-7488,0514-5163
DOI: 10.2472/jsms.16.809