Index Catalog // ScholarsArchive@OSU

Supercritical fluid (SCF) treatment: Its effect on bending strength and stiffness of ponderosa pine sapwood

Creator:: Smith, Susan M., Demessie, E. Sahle, Morrell, Jeffrey J., Levien, Keith L., and Ng, Harry
Abstract:: Adverse effects on mechanical properties from using a supercritical fluid (SCF) to increase preservative penetration of refractory woods were evaluated by treating small ponderosa pine sapwood specimens with supercritical carbon dioxide at 64 combinations of temperatures (35 to 80 C), pressure (1,000 to 4,000 psig), and time (0.5 to 2...
Resource Type:: Article
Full Text:: STRENGTH AND STIFFNESS OF PONDEROSA PINE SAPWOOD Susan M. Smith Senior Research Assistant Department

Effects of supercritical fluid treatments on physical properties of wood-based composites

Creator:: Acda, Menandro N., Morrell, Jeffrey J., and Levien, Keith L.
Abstract:: The effects of supercritical fluid (SCF) impregnation on physical properties of composites were investigated at various pressures, temperatures, and treatment times with carbon dioxide as the fluid and tebuconazole as a biocide. In general, within the ranges tested, SCF treatment had no negative effects on modulus of rupture (MOR), modulus...
Resource Type:: Article
Full Text:: Keith L. Levien Associate Professor Depanment of Chemical Engineering Oregon State University

Effect of process variables on supercritical fluid impregnation of composites with tebuconazole

Creator:: Acda, Menandro N., Morrell, Jeffrey J., and Levien, Keith L.
Abstract:: This study examines the effects of pressure, temperature, and treatment time on supercritical fluid impregnation of such composites as plywood, particleboard, flakeboard, and medium-density fiberboard. Carbon dioxide with methanol as a cosolvent was used as the supercritical fluid, with tebuconazole as the biocide. Biocide distribution, as measured by extraction and...
Resource Type:: Article
Full Text:: Keith L. Levien Associate Professor Department of Chemical Engineering Oregon State University

Effect of process variations during supercritical fluid impregnation on cyproconazole retention and distribution in ponderosa pine sapwood

Creator:: Kang, Sung-Mo, Levien, Keith L., and Morrell, Jeffrey J.
Abstract:: The effect of process variations under supercritical conditions on cyproconazole retention and distribution in ponderosa pine sapwood boards was assessed. While pressure and temperature appeared to affect biocide solubility to some extent, the overall results suggested that biocide movement into wood was influenced more by diffusion than bulk flow. Biocide...
Resource Type:: Article
Full Text:: Postdoctoral Research Associate Department of Wood Science and Engineering Keith L. Levien Associate Professor

Internal pressure measurement techniques and pressure response in wood during treating processes

Creator:: Schneider, Philip F., Levien, Keith L., and Morrell, Jeffrey J.
Abstract:: The development of pressure inside wood during preservative impregnation was studied using Douglas-fir heartwood and ponderosa pine sapwood. Pressure sensors mounted on sample holders provided the most reliable measurements. As expected, pressure equilibrated most rapidly with air as the treatment medium and ponderosa pine as the test species. Pressure changes...
Resource Type:: Article
Full Text:: Protection, Inc. 3941 Bonsal Rd. Conley, GA 30288 Keith L. Levien Associate Professor Department of

Supercritical carbon dioxide treatment: Effect on permeability of Douglas-fir heartwood

Creator:: Demessie, Endalkachew Sahle, Hassan, Ali, Levien, Keith L., Kumar, Satish, and Morrell, Jeffrey J.
Abstract:: The effect of supercritical fluid treatment on superficial gas permeability of Douglas-fir was investigated by using carbon dioxide either alone or amended with methanol. Permeability increased in a majority of samples, although nearly one-third of the specimens declined in permeability. Improvements in permeability appeared to be unrelated to variations in...
Resource Type:: Article
Full Text:: Graduate Research Assistant Keith L. Levien Associate Professor Depanment of Clem~cal Engineering

Multi-scale Drivers of Spatial Variation in Old-Growth Forest Carbon Density Disentangled with Lidar and an Individual-Based Landscape Model

Creator:: Seidl, Rupert, Spies, Thomas A., Rammer, Werner, Steel, E. Ashley, Pabst, Robert J., and Olsen, Keith
Abstract:: Forest ecosystems are the most important terrestrial carbon (C) storage globally, and presently mitigate anthropogenic climate change by acting as a large and persistent sink for atmospheric CO₂. Yet, forest C density varies greatly in space, both globally and at stand and landscape levels. Understanding the multi-scale drivers of this...
Resource Type:: Article
Full Text:: Seidl,1,2* Thomas A. Spies,3 Werner Rammer,2 E. Ashley Steel,4 Robert J. Pabst,1 and Keith Olsen1

The Northern Goshawk on the Southern Blue Mountains and Malheur National Forest: A Technical Review of its Status, Ecology and Management

Creator:: Goodell, John M. and Seager, S. Trent
Abstract:: Stakeholders in the southern Blue Mountains have reported a need for a scientific review of the northern goshawk (Accipiter gentilis atricapillus; hereafter, goshawk) in relation to dry forest restoration and management activities. Here, we provide a compilation of relevant synthesis papers, existing peer-reviewed research, and goshawk monitoring efforts in the...
Resource Type:: Technical Report
Full Text:: , Sam Hobson, Rob Miller, Rob Palmer, Abbott Schindler, and Keith Thompson. Please do not use any of

Including wood stiffness in tree improvement of coastal Douglas-fir in the US Pacific Northwest: a literature review and synthesis

Creator:: Jayawickrama, K. J. S., Ye, T. Z., Gupta, R., and Cherry, M. L.
Resource Type:: Technical Report
Full Text:: layout by Forestry Communications Group. Cover photo by Keith Jayawickrama. The Forest Research

Habitat use by snag-associated species : a bibliography for species occurring in Oregon and Washington

Creator:: Weikel, Jennifer M., Hayes, John P. (John Parker), and Oregon State University. Forest Research Laboratory
Abstract:: Fifty-seven species of wildlife rely on or frequently use snags for breeding, roosting, or denning in Oregon and Washington. Several publications offer information on use of snags by wildlife, influence of management activities on snags and snag users, and approaches to managing snags to benefit wildlife. Because of the diverse...
Resource Type:: Technical Report
Full Text:: Jennifer M. Weikel and John P. Hayes Photograph by Rebecca Goggans

ScholarsArchive@OSU

Supercritical fluid (SCF) treatment: Its effect on bending strength and stiffness of ponderosa pine sapwood

Effects of supercritical fluid treatments on physical properties of wood-based composites

Effect of process variables on supercritical fluid impregnation of composites with tebuconazole

Effect of process variations during supercritical fluid impregnation on cyproconazole retention and distribution in ponderosa pine sapwood

Internal pressure measurement techniques and pressure response in wood during treating processes

Supercritical carbon dioxide treatment: Effect on permeability of Douglas-fir heartwood

Multi-scale Drivers of Spatial Variation in Old-Growth Forest Carbon Density Disentangled with Lidar and an Individual-Based Landscape Model

The Northern Goshawk on the Southern Blue Mountains and Malheur National Forest: A Technical Review of its Status, Ecology and Management

Including wood stiffness in tree improvement of coastal Douglas-fir in the US Pacific Northwest: a literature review and synthesis

Habitat use by snag-associated species : a bibliography for species occurring in Oregon and Washington

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