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Showing 1 to 20 of 70 for “"yellow-poplar"”.
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Peroxyalkanoic cellulose purification of steam exploded yellow poplar
Water and alkali extracted steam exploded yellow poplar fiber (log R₀ 4.25) was purified through a multi-stage process. The initial stage consisted of peralkanoic acid treatment, either formic or acetic acid, at atmospheric pressure. Subsequent bleaching was achieved through treatment with alkaline …
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Practical drying techniques for yellow-poplar S-D-R flitches
The S-D-R (Saw-Dry-Rip) process is a proven method of reducing warp in manufacturing hardwood studs. It has been assumed that its success is partially due to the stress relaxation caused by high-temperature drying. Implementation of this S-D-R process in the Appalachian region has been limited as …
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Compatible taper and volume equations for yellow-poplar in West Virginia
Yellow-poplar (Liriodendron tulipifera L.) is an important source of raw material for the forest products industry in West Virginia. Accurate taper and volume functions are an important component of most inventory systems for use in estimating upper stem diameter, form, and tree volume. Compatible …
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Economic analysis of thinning alternatives in natural stands of yellow-poplar
… landowners to evaluate thinning alternatives in yellow-poplar stands. The program is written Applesoft BASIC for the APPLE II+ microcomputer with a design which emphasizes flexibility and ease of use. The program consists of two primary segments: growth and yield, and economic evaluation. The …
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Cross-Laminated Timber made of Unmodified and Thermally Modified Yellow-Poplar Lumber
… durability and reduce moisture-related issues. Yellow-poplar (YP), abundant in the Appalachian region, is a promising raw material due to its availability and favorable mechanical properties and incorporating its TMW into CLT outer layers offers a sustainable strategy to improve moisture …
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A growth and yield prediction model for thinned stands of yellow- poplar
… growth and cubic-foot volume growth and yield in yellow-poplar stands after a single thinning indicated that a separate set of coefficients was required for stands thinned twice. A joint loss function involving both volume and basal area was used to estimate the coefficients in the system of …
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The effect of moisture gradients on the stiffness and strength of yellow-poplar
… gradients on the stiffness and strength of yellow-poplar beams. An additional objective was to experimentally determine gradient effects in yellow-poplar beams. Three-dimensional finite-element modeling was employed and several subsidiary models were developed. Among these was a …
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The economic feasibility of producing yellow-poplar oriented strandboard in the Appalachian region
… has been conducted in order to determine whether yellow-poplar (Liriodendron tulipifera Michx.), has the economic and technical potential to be manufactured and marketed as oriented strandboard (OSB) in Elkins, West Virginia and Frederick, Maryland. The estimated annual excess growth of …
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Microbial ecology of freshly sawn yellow-poplar lumber ( Liriodendron tulipifera L.) in two seasons
… of the microbial ecology of green lumber of yellow-poplar (Liriodendron tulipifera L.) during storage as a precursor to the development of biological control agents for use on freshly sawn lumber. (Abstract shortened by UMI.).
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Development of dimension lumber grade and yield estimates for yellow-poplar sawlogs and trees
… is that eastern hardwoods in general, and yellow-poplar (Liriodendron tulipifera L.) in particular, are underutilized. At present, dimension lumber used in light frame construction is almost exclusively manufactured from softwood species. Recent literature, research, and conferences have …
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Factors influencing basal area growth of yellow-poplar ( Liriodendron tulipifera L.) in central West Virginia
… (CFI) plots to evaluate basal area growth of yellow-poplar (Liriodendron tulipifera L.) as related to four topographic factors (aspect, slope position, steepness, and landform), two competition variables (basal area per acre and trees per acre) and four tree characteristics (age, diameter, …
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The effects of fertilization and release on growth, physiology, nutrition, and sapwood quality of young yellow-poplar
… of crop tree release and fertilization of young yellow-poplar on low and medium quality Southern Appalachian sites were compared. In June of 1989 96 individual 10 year-old yellow-poplar crop stems were treated in factorial combinations. The crop trees were either released, using a 4% triclopyr …
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Characterizing the chemistry of yellow-poplar surfaces exposed to different surface energy environments using DCA, DSC, and XPS
… energy changes in extracted and unextracted yellow-poplar upon exposure to aluminum, teflon, and heat/air surface treatments have been described using dynamic contact angle (DCA) and X-ray photoelectron spectroscopy (XPS) analysis. Results show that the surface molecular orientation of …
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Spatial and temporal analysis of radial growth in an Appalachian watershed
… growth and climate for four hard wood species, yellow-poplar, northern red oak, chestnut oak and red maple, growing on contrasting topographic aspects of a watershed in north-central West Virginia.;The study showed that all species except northern red oak showed significant differences in growth …
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Species Dependence of pMDI/Wood Adhesion
… differences in adhesion between southern yellow pine and yellow-poplar bonded with pMDI. Secondly, an improvement in the synthesis of 13C, 15N labeled pMDI is discussed. Mode I fracture results show that pMDI adhesion was affected differently by southern yellow pine compared yellow poplar. …
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A theoretical and experimental investigation of moisture diffusion in wood
… curves were generated from the drying of yellow poplar. Solutions to the diffusion equation using coefficients from the literature were then compared with the experimental data. The diffusion coefficient of yellow poplar was determined directly from the concentration-distance curves by the …
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Effect of Minimum Suppression and Maximum Release Years on Compression Parallel to Grain Strength and Specific Gravity for Small-sized Yellow-poplar (Liriodendron tulipifera L.) Specimens
… gravity and ring width or growth rate in yellow-poplar (Liriodendron tulipifera L.). Because most mechanical properties of wood are also closely related to specific gravity, it would thus be of interest to learn how minimum suppression and maximum release years' evidence that can be …
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Growth response and drought susceptibility of forest trees exposed to simulated acidic rain and ozone
… seedlings of red spruce, loblolly pine, yellow-poplar, and sweetgum were exposed to ozone (0.0 or 0.1 ppm, 4 hr d⁻¹, 3 d wk⁻¹) in combination with simulated acidic rain (pH 5.6 or 3.0, 1 h d⁻¹, 2 d wk⁻¹, 0.75 cm hr⁻¹) for ten weeks. After the ten-week treatment with ozone and simulated …
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An analysis of the potential effects of air pollutants emitted during coal combustion on yellow poplar and loblolly pine and influences on mycorrhizal associations of loblolly pine
Yellow poplar (Liriodendron tulipifera L.) and loblolly pine (Pinus taeda L.), families 2-8 and 540, seedlings were fumigated with 0.07 ppm ozone, 0.06 ppm sulfur dioxide 0.07 ppm ozone + 0.06 ppm sulfur dioxide, 0.06 ppm sulfur dioxide + 0.10 ppm nitrogen dioxide and 0.07 ppm ozone + 0.06 ppm …
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