It is difficult to treat the heartwood of many wood species with liquid preservatives using conventional liquid processes. Supercritical fluids (SCF) used as carriers of preservatives to impregnate refractory wood species may be an attractive alternative to conventional liquid carriers. While SCF impregnation has many potential advantages, some wood species...
Five different test methods to determine the parallel-to-grain shear
strength of Douglas-fir structural lumber were compared. Four methods
assessed the shear strength of lumber sections having a full nominal two by
four inch cross-section. These were: three-point bending, four-point bending,
five-point bending, and torsion. The fifth method was the ASTM...
Metham sodium or NaMDC is one of the four major soil
fumigants that are currently registered for controlling
internal decay of wood products in use. Fumigants are used
primarily in utility poles but are also applied to piling,
timbers and other large wood members.
NaMDC must decompose to fungitoxic compounds...
The goal of this research is to develop automatic techniques for
identifying defects in Douglas-fir veneer. To achieve this goal,
computer vision techniques, in particular image-processing, will be
applied. Several pre-processing steps may be required to enhance
images in making further analysis easier, faster, and more reliable.
Pre-processing is often...
The purpose of this study was to determine if amount and kind of thinning had an effect on wood specific gravity, modulus of rupture, modulus of elasticity, growth rate, or pulp yield and kappa number. The study involved 24 1/5-acre plots, three plots in each of eight thinning treatments. The...
Three methods--radial compression strength, color indicators of decay and micro-toughness, an examination of tracheid fracture patterns, were evaluated for detection of early decay and for application to field use. Three-eighth-inch diameter plugs 3/4-inch long, cut from the sapwood and heartwood of a Douglas-fir pole free of decay, were decayed by...