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 25 for “"heartwood"”.
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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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Longitudinal air permeability of lodgepole pine
… specimens from 279 trees, two sapwood and two heartwood replicates, representing two varieties of lodgepole pine (Pinus contorta, vars. latifolia and murrayana) were measured with a steady state apparatus. It was found that the mean ratio of sapwood to heartwood permeability was ca. 10:1 for …
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Extractives from Sitka spruce
… of the tree, particularly the sapwood to heartwood transformation. The first objective of the research was to study the distribution of extractives within Sitka spruce trees at different heights in the trunk, as well as the distribution between bark, rootwood, knotwood, heartwood and …
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Study of the Metabolic Effects of Water-alcoholic Extracts of Heartwoods with Traditional Use in Bulgaria // Проучване метаболитните ефекти на водно-алкохолни екстракти от дървесини с традиционно приложение в България
… Polyphenol content and antioxidant activity of heartwoods traditionally used for coloring of high alcoholic beverages are not studied yet in Bulgaria. The toxicity and therapeutic potential of the mulberry (Morus nigra) heartwood ethanol infusion remains unknown. The aim of this study was to …
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PILOT STUDY ON THE PREDICTION OF HEART ROT IN APPARENTLY SOUND WESTERN LARCH
… Better information regarding conditions and heartwood decay-causing fungi important to heart rot in apparently sound trees would aid in retention decisions. We combined data from the 2003 Westside Reservoir and Roberts Fire burns with data from the USFS Forest Health Protection’s 10-year …
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PILOT STUDY ON THE PREDICTION OF HEART ROT IN APPARENTLY SOUND WESTERN LARCH
… Better information regarding conditions and heartwood decay-causing fungi important to heart rot in apparently sound trees would aid in retention decisions. We combined data from the 2003 Westside Reservoir and Roberts Fire burns with data from the USFS Forest Health Protection’s 10-year …
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Shrinkage characteristics of lodgepole pine
… linear association between specific gravity and heartwood percent was also significant. For var. murrayana, no difference in shrinkage or specific gravity was detected between the heartwood and sapwood. For var. Iatifolia, heartwood shrank less radially and had a lower specific gravity than …
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Productivity and biomass partitioning in 20-year Black cottonwood at variable spacing
… biomass production, bark, sapwood and heartwood ratios and the branching ratio in 20-year old Black cottonwood (Populus balsamifera L. ssp. trichocarpa (Torr. & A. Gray ex Hook.) Brayshaw) experimental plantation within Sandlækjarmýri research forest in southern Iceland. Data and wood …
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The Oak Wilt Fungus, Ceratocystis Fagacearum (Bretz) Hunt: Studies of Therate and Extent of Fungus Penetration in Oak Roots and the Nature of a Toxic Principle in Oak Heartwood Which Inhibits Growth of the Fungus
Made available in DSpace on 2014-12-05T20:30:07Z (GMT). No. of bitstreams: 1 0025195.pdf: 2982230 bytes, checksum: 0a28da1c01691d52a0ea62167f8adba8 (MD5) Previous issue date: 1957
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Stimulation of Western Australian Sandalwood (Santalum spicatum) oil production using multiple treatments [thesis]
… and chemical treatments on oil production and heartwood formation in WA sandalwood, with the aim being to increase oil production, thus allowing the time between establishment and harvesting to be reduced. This study was conducted over three plantations in the Wheatbelt region of Western …
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Monomeric Ellagitannins in Oaks and Sweetgum
… the case of oaks, ellagitannin concentrations in heartwood can reach up to 10% (dry wt. basis). These secondary metabolites are not only important physiologically but also influence the economic value and quality of wood products that contain them. Efforts were made to develop and validate the …
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Wood cell wall modification with hydrophobic molecules
… These methods were partly inspired by the heartwood formation in living trees, a process, that for some species results in an insertion of hydrophobic chemical substances into the cell walls of already dead wood cells, In the first part of this thesis a chemistry to modify wood cell walls …
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Adhesion Fundamentals in Spotted Gum (Corymbia citriodora)
… differences. Analysis of the plantation-grown heartwood (inner, middle, and outer heartwood regions) revealed significant wetting differences on spotted gum with only minor differences on Gympie messmate. The Australian woods were compared to two North American woods-loblolly pine (Pinus taeda) …
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Mechanical behavior of red oak in transverse compression as affected by hydro-treatments and its relations to changes in cell wall structure and composition
… oak was investigated. Small specimens of red oak heartwood were submitted to steam-treatments at atmospheric pressure for 1.5, 3, 6, 12, 24, 48, and 96 hours. Short steaming induced little or no changes in the properties and the composition of red oak. Prolonged steaming, however, resulted in …
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A Comparison of Artificial Neural Network Classifiers for Analysis of CT Images for the Inspection of Hardwood Logs
… poplar. These classifiers recognize six classes: heartwood (clear wood), sapwood, knots, bark, split s and decay. This demonstrates the feasibility of developing general classifiers that can be used with different types of hardwood logs. This will help sawmill and veneer mill operators to improve …
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Stand structure development effects on wood quality of Melina (Gmelina arborea roxb.)
… Cordoba region. Dendrometric variables such as heartwood, sapwood, and diameter and crown height are good estimators of tree volume, taper and branch modeling.
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Using bio-chars as potential catalysts for upgrading wood pyrolysis vapors
… behavior for wood components (bark, sapwood and heartwood) and individual wood-polymers (cellulose, hemicellulose and lignin) of typical hardwood is presented. Two hardwood species, namely red oak and yellow-poplar, were separated into their bark, sapwood and heartwood components. The samples …
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Characterisation of sandalwood essential oils using high performance thin-layer chromatography and high resolution gas chromatography mass spectrometry
… applied to extract oil from 340 milled heartwoods of Santalum spicatum. GC-MS analysis was performed on oil extracts. Variation in sesquiterpene composition of 340 heartwood oil extracts of Santalum spicatum sampled from 19 locations across five regions in Western Australia was explored. …
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Adhesive Bonding of Low Moisture Hickory Veneer with Soy-based Adhesive
… Impacts of moisture content and wood region (heartwood versus sapwood) were analyzed with dry and wet shear bond strength tests, measurement of percent wood failure, lathe check characterization, and adhesive bondline thickness and penetration depth measurement. Impact of wood region and type …
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Moisture conditions in rain exposed wood joints - Experimental methods and laboratory measurements
… on Norway spruce (Picea abies (L.) Karst.) heartwood and sapwood. Both slow grown wood from northern Sweden and fast grown wood from southern Sweden were used in the experiments. The duration of high moisture contents was evaluated for all joints. In addition, the measured moisture contents …
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