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Interactions of ammoniacal copper zinc arsenate (ACZA) wood preservative with Douglas-fir

Creator:: Lebow, Stan T.
Abstract:: The use of the waterborne wood preservative, ammoniacal copper zinc arsenate (ACZA), is likely to increase in the near future because of environmental concerns associated with oilborne preservatives. Developing an understanding of the permanence of this preservative in wood will become important from both environmental and performance standpoints. Conventional thinking...
Resource Type:: Dissertation

Extraction and properties of Douglas-fir sapwood polyphenol oxidase

Creator:: Musbah, Durria Abdel Azim
Abstract:: Chemical stains that develop on commercial woods are problems of great economic importance. The polyphenol oxidases catalyze the oxidation of the phenolics that naturally exist in plants to quinones when the cell structure is disrupted. The quinones produced are further oxidized and polymerized to melanin, the pigment which is responsible...
Resource Type:: Dissertation
Full Text:: Properties of Douglas-fir Sapwood Polyphenol Oxidase Abstract approved:2'A Dr. Murray L. Laver structure is

Wood quality and strength relationships in Douglas-fir (Pseudotsuga mezieseii (Mirb.) Franco) wood of different maturity

Creator:: Carter, Keoki Apokolani
Abstract:: The objectives of this study were to determine: 1) differences in average wood quality and strength properties of clear-wood specimens sampled from juvenile, transition, and mature wood zones in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees from known forest sites; 2) relationships among wood quality properties [specific gravity (SG), rings per...
Resource Type:: Masters Thesis

The effects of tree position and silvicultural practices on treatability of Douglas-fir lumber

Creator:: Hong, Seungdo
Abstract:: In spite of the lack of accurate information about the treatability of western wood species with waterborne wood preservatives, consumption of these products continues to increase. Western wood species, notably Douglas-fir, are notoriously difficult to treat with waterborne systems, yet there is relatively little data on the effects of wood...
Resource Type:: Masters Thesis
Full Text:: and Silvicultural Practices on Treatabilitv of Douglas-fir Lumber Abstract approved: if U.J. Morrell

Intra-ring variations in mature Douglas-fir trees from provenance plantations

Creator:: Abdel-Gadir, Abdelazim Yassin
Abstract:: The purpose of this study was to investigate variation in some intra-ring characteristics in juvenile and mature wood from two Douglas-fir genetic plantations established in 1912 by the U.S. Forest Service. The experimental material consisted of progeny from thirty families representing ten provenances (3 families per provenance) grown in two...
Resource Type:: Dissertation

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

Comparative test methods for evaluating shear strength of structural lumber

Creator:: Riyanto, Djoko S.
Abstract:: 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...
Resource Type:: Masters Thesis

Studies on thermal degradation of Douglas-fir wood and bark

Creator:: Ali, Mohamed Aslam
Resource Type:: Dissertation

Decomposition of Basamid in Douglas-fir heartwood

Creator:: Forsyth, Paul Griffin
Abstract:: Basamid^R (3,5-dimethy1-1,3,5,2H-tetrahydrothiadiazine- 2-thione) is a crystalline powder used as a soil sterilant. This fumigant acts in soil by decomposing to methylisothiocyanate (MITC), the primary active ingredient, as well as hydrogen sulfide, methylamine, and formaldehyde. In wood, Basamid decomposes too slowly to be efficacious against decay fungi unless amended with various...
Resource Type:: Dissertation

Fungitoxicities of NaMDC decomposition products to decay fungi colonizing Doulgas-fir and ponderosa pine wood

Creator:: Canessa, Edwin
Abstract:: 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...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Interactions of ammoniacal copper zinc arsenate (ACZA) wood preservative with Douglas-fir

Extraction and properties of Douglas-fir sapwood polyphenol oxidase

Wood quality and strength relationships in Douglas-fir (Pseudotsuga mezieseii (Mirb.) Franco) wood of different maturity

The effects of tree position and silvicultural practices on treatability of Douglas-fir lumber

Intra-ring variations in mature Douglas-fir trees from provenance plantations

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

Comparative test methods for evaluating shear strength of structural lumber

Studies on thermal degradation of Douglas-fir wood and bark

Decomposition of Basamid in Douglas-fir heartwood

Fungitoxicities of NaMDC decomposition products to decay fungi colonizing Doulgas-fir and ponderosa pine wood

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