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Leaf area, stemwood volume growth, and stand structure in a mixed-species, multi-aged northern conifer forest /Kenefic, Laura S. January 2000 (has links)
Thesis (Ph. D.) in Forest Resources--University of Maine, 2000. / Includes vita. Includes bibliographical references (leaves 134-143).
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Schedule and post-drying storage effects on Western Hemlock squares qualityRohrbach, Katrin 11 1900 (has links)
This study intends to explore the effects of two drying schedules with options of conditioning and post-drying storage on the drying speed and quality of western hemlock timbers.
Western hemlock (Tsuga heterophylla), the species of interest in this study, is one of British Columbia's most abundant tree species that accounts for 75 to 80% of British Columbia's exports to Japan. It is usually combined with amabilis fir (Abies amabilis) for processing and economical purposes. Hemlock is difficult to dry due to its compression wood, wetpockets and large spread of initial moisture content and basic density. Consequently, it seems practical to dry hemlock by itself.
In this study, hemlock was dried using two different schedules with optional conditioning and optional seven day post-drying storage in a covered and climatized space. These eight experimental runs were compared to a control run, which utilized an established drying schedule. To assess the kiln dried timber quality, twist, diamonding, and checks were evaluated using pre-drying and post-drying and/or post-storage measurements. Drying times and casehardening were also considered.
Data analysis and evaluation illustrated that conditioning and the harsher schedule reduced casehardening, while the milder schedule developed less twist and diamonding. Even though it appears that the control run developed less shape distortions than the treatment runs, the control run required longer drying times. When using the harsher schedule the kiln was immediately available for the next run, and the dried timber could be stored in a covered area in order to level out the moisture gradients and alleviate casehardening. As a subsequent step, the timber could be planed to reduce twist, diamonding and superficial checks.
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Indentation hardness of Douglas fir and Western hemlock lumber related to densityCorder, Stanley E. 12 May 1967 (has links)
Indentation hardness tests were made on sections of 211 pieces
of Douglas fir and 208 pieces of Western hemlock at a moisture content
of about 11 percent. Specific gravity and visual-density evaluations
were also determined.
Correlation coefficients for linear regression of density, as
measured by specific gravity, on average standard hardness were
0.826 for Douglas fir and 0.842 for Western hemlock.
Classification according to specific gravity was better using
hardness classes compared to using visual-density classes. / Graduation date: 1967
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Schedule and post-drying storage effects on Western Hemlock squares qualityRohrbach, Katrin 11 1900 (has links)
This study intends to explore the effects of two drying schedules with options of conditioning and post-drying storage on the drying speed and quality of western hemlock timbers.
Western hemlock (Tsuga heterophylla), the species of interest in this study, is one of British Columbia's most abundant tree species that accounts for 75 to 80% of British Columbia's exports to Japan. It is usually combined with amabilis fir (Abies amabilis) for processing and economical purposes. Hemlock is difficult to dry due to its compression wood, wetpockets and large spread of initial moisture content and basic density. Consequently, it seems practical to dry hemlock by itself.
In this study, hemlock was dried using two different schedules with optional conditioning and optional seven day post-drying storage in a covered and climatized space. These eight experimental runs were compared to a control run, which utilized an established drying schedule. To assess the kiln dried timber quality, twist, diamonding, and checks were evaluated using pre-drying and post-drying and/or post-storage measurements. Drying times and casehardening were also considered.
Data analysis and evaluation illustrated that conditioning and the harsher schedule reduced casehardening, while the milder schedule developed less twist and diamonding. Even though it appears that the control run developed less shape distortions than the treatment runs, the control run required longer drying times. When using the harsher schedule the kiln was immediately available for the next run, and the dried timber could be stored in a covered area in order to level out the moisture gradients and alleviate casehardening. As a subsequent step, the timber could be planed to reduce twist, diamonding and superficial checks.
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Application of western hemlock yield tables for Oregon and Washington to stands in Alaska and British Columbia /Robinson, Walter Lee. January 1951 (has links)
Thesis (M.F.)--Oregon State College, 1951. / Typescript. Includes bibliographical references (leaf 50). Also available on the World Wide Web.
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Poison hemlock (conium Maculatum L.) biology, implications for pastures and response to herbicides /Woodard, Carl Andrew. January 2008 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2008. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on September 19, 2008) Includes bibliographical references.
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Cutting plans and logging costs in a 100-year-old stand of Sitka spruce and western hemlock /Ruth, Robert Harvey. January 1950 (has links)
Thesis (M.F.)--Oregon State College. / Includes bibliographical references (leaves 107-109). Also available on the World Wide Web.
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The biology and ecology of buprestid borers attacking hemlock in the Flambeau River State ForestAbdul Hussain, Ali, January 1956 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1956. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Bibliography: leaves 137-140.
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Age structural dynamics of Abies balsamea and Tsuga canadensis /Hett, Joan Margaret, January 1900 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1969. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliography.
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Vegetation-environmental relationships on two clearcuts on the western slopes of the Oregon Cascades /Egeland, Dawn M. January 1985 (has links)
Thesis (M.S.)--Oregon State University, 1986. / Typescript (photocopy). Includes bibliographical references (leaves 104-111). Also available on the World Wide Web.
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