Index Catalog // ScholarsArchive@OSU

Rheological behavior of Douglas-fir as related to the process of drying

Creator:: Wu, Qinglin
Abstract:: Large inelastic strain occurs inside a piece of lumber during drying. The strain consists of several components such as elastic, plastic, creep, shrinkage and mechano-sorptive effect. The mechanical behavior of the whole board during drying is determined by the behavior of individual strain components and their interactions. Whereas limited investigations...
Resource Type:: Dissertation

An analysis of consumer response to environmentally certified, ecolabeled forest products

Creator:: Anderson, Roy Carl
Abstract:: Historically, researchers have used surveys, focus groups, and anecdotal evidence to evaluate consumer response to environmentally certified, ecolabeled forest products. These methods generally measure consumer attitudes toward certified forest products. Since the strength of the correlation between attitudes and behavior has long been questioned, consumer response to certified forest products...
Resource Type:: Dissertation

Discrete compression web bracing design for light-frame wood trusses

Creator:: Waltz, Miles E.
Abstract:: As part of a roof framing system, light-frame wood trusses often require lateral bracing to reduce the effective length for flexural buckling of compression web members. This observational research investigates the design requirements for discrete compression web bracing intended to provide such lateral support. Four simple brace analysis methods based...
Resource Type:: Masters Thesis

Three strategies for tree bucking at the harvest site: consequences for the sawmill

Creator:: Acker, Timothy A.
Abstract:: The timber shortage in the Pacific Northwest is forcing sawmill owners to improve the competitiveness of their harvesting and processing operations. A computer simulation and financial statement analysis were used to compare the processing efficiency and profitability of three bucking strategies: log cost minimization (traditional 40-foot preferred-length logs); hauling length...
Resource Type:: Masters Thesis

Thermo-hygro rheological behavior of materials used in the manufacture of wood-based composites

Creator:: Ren, Shan
Abstract:: Thermo-hygro-rheology of wood-adhesive systems plays an important role during the hot pressing process of wood based composites. The principal objective of this research is to quantitatively study the thermo-hygro rheological characteristics of wood-adhesive systems used in such composites. This is with a view to providing material characteristics which may be...
Resource Type:: Dissertation

Integration of an expert system and dynamic programming approach to optimize log breakdown using 3-dimensional log and internal defect shape information

Creator:: Zeng, Yimin
Abstract:: A computer program, SAW3DG, was developed to optimize log breakdown using 3-dimensional log and internal defect shapes. The program was based on SAW3D, a log breakdown optimization program considering only 3-dimensional log shape. SAW3D was modified to include internal log defects in 3-dimensional representation and integrated with SLGRADER, an expert...
Resource Type:: Dissertation

Wood density patterns of young Costa Rican trees in planted and natural forests

Creator:: Baker, David C.
Abstract:: In plantation forestry, rapid growth rate is favorable for wood production, but may decrease wood density, which is an important indicator of wood quality for both pulp and solid wood products. I looked for (1) differences in radial patterns of wood density between planted and naturally grown Costa Rican tree...
Resource Type:: Masters Thesis

Juniper utilization : issues of chemistry and management

Creator:: Swartley, D. Benjamin
Abstract:: Western juniper (Juniperus occidentalis) poses both a challenge and an opportunity for natural resource management in the rangelands of the northern Great Basin. The continued expansion of western juniper on the rangelands of the interior Northwest will likely continue as there are currently no practical options for returning this area...
Resource Type:: Masters Thesis

Hydraulic properties of compression wood in branches and reoriented shoots of Douglas-fir (Psuedotsuga menziesii)

Creator:: Spicer, Rachel
Abstract:: Xylem anatomy is a strong determinant of water transport efficiency and is therefore an important component of the overall hydraulic strategy of any woody plant. However, in addition to its role in water transport, xylem also serves in mechanical support, and these two functions may represent conflicting design requirements. To...
Resource Type:: Masters Thesis

The occurrence of abscisic acid in the dormant shoots of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco]

Creator:: Webber, John Edinburgh
Abstract:: Methanolic extracts of the dormant Douglas-fir shoots (buds, leaves, and stems) were fractionated by solvent partitioning (sodium bicarbonate-diethyl ether). The acidic portion of the extract was subjected to column (Sephadex LH-2O, Silica Gel and Polyvinylpyrrolidone), preparative thick-layer and gas-liquid chromatography. Fractions collected from chromatographic separations were collected and tested for...
Resource Type:: Dissertation

The German publishing industry : managing environmental issues : a teaching case study

Creator:: Hansen, Eric, Lawton, Steve, and Weinfurter, Stefan
Abstract:: This case study describes the challenges that con-front the German publishing industry as it attempts to implement environmentally responsible purchas-ing of paper. German consumers are considered leaders in environmental awareness, and many actively sup-port environmental organizations. This case focuses on how industry and individual companies have responded to demands from...
Resource Type:: Technical Report

Experimental and finite-element analysis of stress distributions near the end of reinforcement in partially reinforced glulam

Creator:: Kirlin, Chad P.
Abstract:: Recently, fiber-reinforced plastics (FRP lamina) have been applied to glued-laminated (glulam) timber for the purpose of improving bending strength and stiffness. Initially, full length reinforcement using FRP lamina was developed. However, the cost of FRP lamina is a significant portion of the total cost of reinforced glulam. Therefore, it is...
Resource Type:: Masters Thesis

Douglas-fir bark : n-hexane-soluble and volatile materials

Creator:: Fang, Henry Hai-loong
Abstract:: Douglas-fir bark was extracted with n-hexane. A light-colored "wax-like" solid was recovered from the extract by evaporation of the solvent. Chemically intact sterol esters and ferulic acid esters were isolated from the "wax" without saponification or degradation as had been necessary in former investigations. The characterization of the intact esters...
Resource Type:: Dissertation

Stopping the Slide -- Market Share Shifts in Structural Floors: A Teaching Case Study

Creator:: Hansen, Eric and Smith, Robert
Abstract:: In this case study, an Oregon softwood lumber company faces deteriorating market conditions and loss of market share for its 2 x 10 and 2 x 12 floor joists in the southern California market. The evolution of the marketplace and the growth in market share of wood I-joists are explained...
Resource Type:: Technical Report

Wood quality studies in second-growth western redcedar (Thuja plicata Donn.)

Creator:: DeBell, Jeffrey D.
Abstract:: Western redcedar (Thuja plicata Donn.) is a valuable commercial species found in the northwestern United States and southwestern Canada. This dissertation includes four papers focused on wood and stem characteristics of second-growth western redcedar, and how those characteristics vary within the stem or how they are influenced by cultural practices....
Resource Type:: Dissertation

Sinuous stem growth in a Douglas-fir (Pseudotsuga menziesii) plantation: growth patterns and wood-quality effects

Creator:: Spicer, R., Gartner, Barbara L., and Darbyshire, R. L.
Abstract:: Stem sinuosity is thought to negatively impact wood quality, but no studies have characterized its vertical and radial effects on wood properties. Here we study wood quality along the entire stem in 25-year-old plantation grown Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) trees (32 trees total) that had been scored...
Resource Type:: Article

Effect of growth rate on the anatomy, specific gravity, and bending properties of wood from 7-year-old red alder (Alnus rubra)

Creator:: Lei, Hua, Gartner, Barbara L., and Milota, Michael R.
Abstract:: Understanding the association between growth rate and wood properties is of practical importance to maximizing and sustaining wood and fiber production. Anatomical characteristics, specific gravity, and bending properties were determined at breast height for thirty 7-year-old trees with varying growth rates, from a red alder (Alnus rubra Bong.) plantation. Wood...
Resource Type:: Article

Trees have higher longitudinal growth strains in their stems than in their roots

Creator:: Gartner, Barbara L.
Abstract:: Longitudinal growth strains develop in woody tissues during cell-wall formation. This study compares stems, which have a mechanical role and experience longitudinal stresses, and nonstructural roots, which have little mechanical role and experience few or no longitudinal stresses, to test the hypothesis that growth strains are produced in stems of...
Resource Type:: Article

The influence of environment, genetics and growth characteristics on tracheid length and specific gravity variation in a Douglas-fir provenance study

Creator:: Nicholas, Darrel Dean
Resource Type:: Masters Thesis

Understanding the chemistry of rosin sizing and developing new sizing technologies

Creator:: Zhuang, Jinfeng
Abstract:: First, a thermodynamic analysis was carried out upon a sizing-desizing process. The energetic analysis shows that rosin soap size should be bound to fibers through primary chemical forces such as covalent bonds to effect sizing. Secondary chemical forces are all thermodynamically unstable to the attack of water molecules. It is...
Resource Type:: Dissertation

ScholarsArchive@OSU

Rheological behavior of Douglas-fir as related to the process of drying

An analysis of consumer response to environmentally certified, ecolabeled forest products

Discrete compression web bracing design for light-frame wood trusses

Three strategies for tree bucking at the harvest site: consequences for the sawmill

Thermo-hygro rheological behavior of materials used in the manufacture of wood-based composites

Integration of an expert system and dynamic programming approach to optimize log breakdown using 3-dimensional log and internal defect shape information

Wood density patterns of young Costa Rican trees in planted and natural forests

Juniper utilization : issues of chemistry and management

Hydraulic properties of compression wood in branches and reoriented shoots of Douglas-fir (Psuedotsuga menziesii)

The occurrence of abscisic acid in the dormant shoots of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco]

The German publishing industry : managing environmental issues : a teaching case study

Experimental and finite-element analysis of stress distributions near the end of reinforcement in partially reinforced glulam

Douglas-fir bark : n-hexane-soluble and volatile materials

Stopping the Slide -- Market Share Shifts in Structural Floors: A Teaching Case Study

Wood quality studies in second-growth western redcedar (Thuja plicata Donn.)

Sinuous stem growth in a Douglas-fir (Pseudotsuga menziesii) plantation: growth patterns and wood-quality effects

Effect of growth rate on the anatomy, specific gravity, and bending properties of wood from 7-year-old red alder (Alnus rubra)

Trees have higher longitudinal growth strains in their stems than in their roots

The influence of environment, genetics and growth characteristics on tracheid length and specific gravity variation in a Douglas-fir provenance study

Understanding the chemistry of rosin sizing and developing new sizing technologies

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