Treesearch

Phenolic compounds are important in the production of bonded-wood products. Phenolic compounds in addition to phenol and resorcinol are potential alternative feedstocks for producing adhesives. The reactivity of a wide variety of phenolic compounds with formaldehyde was investigated using semi-empirical and ab initio computational chemistry methods. Results of these calculations were compared with experimental data. The results indicate that ab initio computational chemistry methods coupled with newer methods for calculating atomic charges can be used to explain the relative reactivities...

Kenaf Tainung 1 cultivar was grown in Madison, WI in 1994. The ratio of core to bast fiber, total plant yield, protein, ash, fiber length, extractives, lignin, and sugar content were determined as a function of growing age. Ash, protein, extractives, L-arabinose, L-rhamnose, D-galactose, and D-mannose contents decreased while lignin, D-glucose and D-xylose content increased as the plant matured. Fiber length increased in the early part of the growing cycle, then decreased, then increased again as the plant matured.

A new species of Cuphophyllus in sect. Virginei is described and illustrated from the Lesser Antilles, and comparisons made with Camarophyllus niveicolor.

This section addresses the design of two types of glulam timber bridges : beam bridges with transverse decks and longitudinal glulam deck (slab) bridges. The material presented in the section is based on the 1992 edition of the AASHTO Standard Specifications for Highway Bridges (AASHTO specifications), including interim specifications through 1993. When specific design requirements or criteria are not addressed by that specification, recommendations are based on referenced standards and specifications or commonly accepted design practice. Because AASHTO specifications are periodically...

When left untreated in many outdoor applications, wood becomes subject to degradation by a variety of natural causes. Although some trees possess naturally occurring resistance to decay (Ch. 3, Decay Resistance), many are in short supply or are not grown in ready proximity to markets. Because most commonly used wood species, such as Southern Pine, ponderosa pine, and Douglas-fir, possess little decay resistance, extra protection is needed when they are exposed to adverse environments. Wood can be protected from the attack of decay fungi, harmful insects, or marine borers by applying...

A *Horn of Plentya awaits veneer producers who attack problems with the right strategies, reduce wood costs, upgrade products.

We derive the predictive distribution for a specified order statistic, determined from a future random sample, under a Dirichlet process prior. Two variants of the approach are treated and some limiting cases studied. A practical application to monitoring the strength of lumber is discussed including choices of prior expectation and comparisons made to a Bayesian parametric approach.

Water repellents and water-repellent preservatives increase the durability of wood by enabling the wood to repel liquid water. This report focuses on water-repellent finishes for wood exposed outdoors above ground. The report includes a discussion of the effects of outdoor exposure on wood, the characteristics of water repellent and water-repellent preservative formulations, and methods for applying these finishes.

This paper presents an overview of selected research at the Forest Products Laboratory (FPL) to characterize the grade distribution and engineering properties of lumber and timber recycled from deconstructed buildings on US. Army installations. The effects of splits on timber beam and column strength and the effects of damage on lumber grade yield are reported here.

Data suggest that the dimerization of coniferyl alcohol is not under thermodynamic control. In this study, molecular dynamics calculations were used to estimate the effect of the solvent environment. In water, the coniferyl alcohol radicals were forced to associate by the formation of a solvent cage. In glycerol, the solvent cage effect appeared to be absent. These results suggest that in water, the product distribution of the dimers will be modified by interactions with the solvent. The computed results are consistent with experimental observations of coniferyl alcohol reactions in...