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Evaluating the quality of Douglas-fir (Pseudotsuga menziessii (Mirb.) Franco) seedlings : a comparison of some current and proposed evaluation methods

Creator:: McCreary, Douglas D.
Abstract:: The physiological condition of tree seedlings at the time they are planted can have a profound impact on their subsequent field performance. Damaged or low vigor seedlings have a much greater chance of dying in the field, or at best, of growing slowly during their initial establishment period. Several methods...
Resource Type:: Dissertation

Photoperiodic responses of Douglas-fir (Pseudotsuga Menziesii (Mirb.) Franco) and Ponderosa pine (Pinus ponderosa) seedlings

Creator:: McCreary, Douglas D.
Abstract:: An important cultural tool in the greenhouse production of tree seedlings in the Pacific Northwest is the control of photoperiod. By artificially lengthening the period of daily exposure to light, it is possible to increase both the magnitude and duration of seedling growth. By shortening the photoperiod, one can induce...
Resource Type:: Masters Thesis

Design and testing of intrusive conductivity probes for the measurement of two-phase flow parameters

Creator:: McCreary, David M.
Abstract:: This thesis examines two techniques for measuring two-phase flow parameters in an air/water system using intrusive conductivity probes. Specifically, the theoretical derivation for measuring void fraction and interfacial area using a two-sensor needle-type probe is derived, and a statistical analysis of the accuracy using the two-sensor probe for measuring interfacial...
Resource Type:: Masters Thesis
Full Text:: measurement of two-phase flow parameters AN ABSTRACT OF THE THESIS OF David M. McCreary for the degree of

Seasoning and machining degrade in young-growth Douglas-fir dimension lumber

Creator:: Anderson, B. G., Knauss, A. C., Frashour, R. G., and Oregon Forest Products Laboratory
Abstract:: The increasing volume of young-growth Douglas-fir timber cut in the Pacific Northwest emphasizes the need for more knowledge on the characteristics of lumber sawed from these trees. The study described here was initiated to learn the extent arid causes of degrade resulting from kiln-drying young-growth Douglas-fir dimension lumber. At the...
Resource Type:: Technical Report
Full Text:: I, Seasoning and Machining Degrade in Young-growth Douglas-fir

Initial study of kiln drying clear Douglas fir planks

Creator:: Stillwell, H. D. and Oregon Forest Products Laboratory
Abstract:: Checking was influenced b drying conditions. This influence was greatest before average moisture content reached 20 per cent, but tension in surface layers caused checking even below this point. Neither high initial dry-bulb temperature nor initial conditions of high equilibrium moisture content were conducive to checking. High temperature and high...
Resource Type:: Technical Report
Full Text:: r - ' ' a Initial Study of Kiln Drying Clear Douglas Fir

Kiln schedules for Douglas fir and western hemlock dimension lumber

Creator:: Kozlik, Charles J. and Oregon State University. Forest Research Laboratory
Resource Type:: Technical Report
Full Text:: I TS37 LO7R4 Scedde4 for Douglas Fir and Western Hemlock

Shrinkage of Douglas fir, western hemlock, and red alder as affected by drying conditions

Creator:: Espenas, Leif D., Oregon State University. Forest Research Laboratory, and Oregon State University. School of Forestry
Abstract:: Moisture content and shrinkage were determined on specimens equilibrated at two conditions for equilibrium moisture content (EMC) at room temperature after the specimens had been dried under a variety of constant temperatures with constant EMC's. Moisture content at room temperature equilibrium was less for specimens dried at high temperature than...
Resource Type:: Technical Report
Full Text:: SHRINKAGE OF DOUGLAS FIR, WESTERN HEMLOCK AND RED ALDER AS AFFECTED BY DRYING CONDITIONS Leif D. Espenas

Effect of kiln conditions on the strength of Douglas fir and western hemlock

Creator:: Kozlik, Charles J. and Oregon State University. Forest Research Laboratory
Abstract:: To test the effects of kiln-drying on strength properties of Douglas fir and western hemlock, temperatures to 230 F, conditions for equilibrium moisture contents of 6 percent and 12 percent, and prolonged heating were investigated. Prolonged heating and choice of conditions for 6 percent or 12 percent equilibrium moisture content...
Resource Type:: Technical Report
Full Text:: g$7 9Effect of Kiln Conditions on the Strength of Douglas

Effect of kiln temperatures on strength of Douglas fir and western hemlock dimension lumber

Creator:: Kozlik, Charles J. and Oregon State University. Forest Research Laboratory
Resource Type:: Technical Report
Full Text:: R Mci 737 7 ffect of Kiln Temperatures on Strength of Douglas

Vapor drying of western woods

Creator:: Graham, R. D. (Robert D.) and Oregon Forest Products Laboratory
Abstract:: The vapor-drying process is described briefly and its present status in industry is discussed. Fairly extensive data on the vapor drying of 1-, 2-, and 4-inch Douglas-fir and 2-inch western hemlock lumber are presented. Exploratory work on the vapor drying of redwood, Pacific madrone, red alder and ponderosa pine is...
Resource Type:: Technical Report
Full Text:: , DEGREES F FIGURE 2. TEMPERATURE AND DRYING DIFFUSION - CONSTANT RELATIONSHIP FOR DOUGLAS- FIR LUMBER. D

ScholarsArchive@OSU

Evaluating the quality of Douglas-fir (Pseudotsuga menziessii (Mirb.) Franco) seedlings : a comparison of some current and proposed evaluation methods

Photoperiodic responses of Douglas-fir (Pseudotsuga Menziesii (Mirb.) Franco) and Ponderosa pine (Pinus ponderosa) seedlings

Design and testing of intrusive conductivity probes for the measurement of two-phase flow parameters

Seasoning and machining degrade in young-growth Douglas-fir dimension lumber

Initial study of kiln drying clear Douglas fir planks

Kiln schedules for Douglas fir and western hemlock dimension lumber

Shrinkage of Douglas fir, western hemlock, and red alder as affected by drying conditions

Effect of kiln conditions on the strength of Douglas fir and western hemlock

Effect of kiln temperatures on strength of Douglas fir and western hemlock dimension lumber

Vapor drying of western woods

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