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Showing 1 to 19 of 19 for “"latewood"”.
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Tensile Properties of Loblolly Pine Strands Using Digital Image Correlation and Stochastic Finite Element Method
… of mechanical properties in earlywood and latewood samples as well as wood strands. The goal of this study was to evaluate the effect of the intra-ring properties and grain angles on the modulus of elasticity (MOE) and ultimate tensile strength (UTS) of different orientation wood strands …
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Modeling thinning effects on ring width distribution and wood specific gravity of loblolly pine (Pinus taeda L.)
… of the tree bole and increases the earlywood and latewood components proportionally maintaining an approximately constant latewood proportion. As a consequence, thinning effects on latewood proportion is not significant; confirming the results obtained in the specific gravity study and further …
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Variation in the Bimodal Precipitation Regime of Southern Nevada, USA Measured in Tree-Ring Isotopes
… between the δ13C of α-cellulose in the latewood and earlywood (δ13CDIFF = latewood - earlywood) portions of a tree ring was highly influenced by the fraction (fSUMMER) of summer precipitation (June-September) to previous cool-season precipitation (October - April). The δ13CDIFF is an …
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Radial growth response of eastern hemlock to infestation of hemlock woolly adelgid
… in radial growth after HWA arrival and latewood produced post- HWA arrival had significantly smaller cells with reduced cell-wall thickness than latewood produced before HWA arrival. This indicates that HWA can reduce a tree's photosynthate production. The relationship between hemlock …
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Dendroclimatology of Pinus sylvestris L. in the British Isles
… been constructed for parameters of earlywood and latewood widths, ring-width, maximum and minimum densities for all sites. The statistical properties of chronologies are related to the latitude and altitude of the sites. Sub-fossil chronologies behave differently to any of the living tree …
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Exploration of Wood DCB Specimens Using Southern Yellow Pine for Monotonic and Cyclic Loading
… because of the stiffness difference between latewood and earlywood growth and the grain angle along the length of the beams. The grain angle and the stiffness difference between latewood and earlywood growth caused the effective stiffness, (ExxI)eff, to vary along the length of the beam. The …
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Characterization of Mixed-Mode Fracture Testing of Adhesively Bonded Wood Specimens
… the intrinsic nature of many wood species, where latewood layers are alternated with earlywood layers, often combine to confound the measures of the critical values of strain energy release rate, Gc. Adhesive layer thickness variations were observed to be substantial also in specimens prepared …
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Analysis of intra-increment pulping and papermaking properties of loblolly pine wood
… fractions; two earlywood a transition and two latewood growth zones. Each growth zone was analyzed for lignin, extractives, and carbohydrate content. Each fraction was digested to four different time schedules using kraft pulping process. All other cooking variables were held constant. A total …
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Tropical Cyclone Storm Surge Detection in Slash Pine Radial Growth along the Northern Gulf of Mexico Coastline
… protection and proximity to a concave coastline. Latewood growth recorded the highest percentage of suppressions associated with storm surge and was generally the quickest growth metric to recover to normal growing conditions. TCs are predicted to become larger and more powerful in the …
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Relationship between Tooth Withdrawal Strength and Specific Gravity for Metal Plate Truss Connections
… neither specific gravity nor percentage of latewood significantly influenced the location of tooth withdrawal. For the LREA orientation, specific gravity alone was a good predictor of ultimate tooth withdrawal stress. Furthermore, the side of the joint test specimen where tooth withdrawal …
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Defining the Regional and Seasonal Climatic Response of Long Douglas-Fir Tree-Ring Chronologies in Central Mexico
… precipitation signal of earlywood (EW) and latewood (LW) tree-ring chronologies and to create a regionally averaged time series that could be considered as a proxy of seasonal climate for specific regions of central Mexico. Monthly and seasonal analyses between the gridded data and the EW …
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Weathering of wood surfaces: characteristics, mechanisms, and prevention
… granular surfaces formed on the cell walls of latewood in response to irradiation with ultraviolet light. Spectrophotometric studies on the chemical changes of exposed wood, lignin, and cellulose revealed that photochemical reactions primarily took place in lignin, leading to the generation of …
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Proton magnetic resonance of wood and water in wood
… T1 measurements of water in the early wood and latewood regions, and separateT1 measurements of the cell wall water and lumen water were acquired. The results indicated that, on the T1 time scale of 100 ms, all proton environments are mixed by diffusion of the water. The T1 of the water in the …
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Is Chir Pine Displacing Banj Oak in the Central Himalaya? Socioeconomic Implications for Local People and the Conservation of Oak Forest Biodiversity
… response to warm season precipitation in latewood, which indicate that an increase in summer rainfall associated with anthropogenic climate change could adversely affect the chir pine. Banj oak does not form reliable annual rings, so we do not have any information regarding the potential …
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A Dendroclimatic Investigation of Southwestern Saskatchewan
… tree-ring chronologies (annual, earlywood, and latewood) and streamflow data, and multiple linear regression techniques were used to create robust multi-proxy reconstructions of mean summer (June – August) and average water-year (October – September) streamflow of the Frenchman River, Battle …
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Structure Based, Two-dimensional, Anisotropic, Transient Heat Conduction model for Wood
… conductivity and structure parameters, such as latewood percentage and cell wall percentage, were examined. Linear relationships for the thermal conductivity and average temperature in wood were established in both radial and tangential directions of three wood species. A two-dimensional …
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A numerical and experimental study of initial defibration of wood
… of earlywood are very different from those of latewood and that the specimen orientation versus loading direction has a strong effect on both the failure process and energy consumption. When numerical analyses of initial defibration processes are to be performed, two main approaches may be …
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Seasonal Influences on the Carbon-Water Relations in Ponderosa Pine Forests in the Northern Boundary of the North American Monsoon System
… of the tree rings (e.g., earlywood and latewood) collected from a network of thirteen sites along a latitudinal gradient extending from southern Arizona and New Mexico, through southwest Colorado, and up to northern Utah. The analysis is based on biological and physical processes and …
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Wachstumsraten, Wachstumsmuster und Wachstumsstörungen tropischer Bäume: Analyse von Langzeiteffekten und kurzfristigen Störungen mit Hilfe von Jahrringstudien
… sequence of parenchyma bands at the end of the latewood, followed by a relatively distant sequence of parenchyma bands in the subsequent early wood of a tree ring. However, it was impossible to establish a chronology, solely by tree-ring width measurements and crossdating, for a number of …