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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:: of Forest Products Oregon State University Corvallis, OR 9733 1 E. Sahle Demessie Graduate

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:: OF DOUGLAS-FIR HEARTWOOD1 Endalkachew Sahle Demessie Graduate Research Assistant Ali Hassan

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:: . MORRELL, J. J., K. L. LEVIEN, E. SAHLE-DEMESSIE, S. KUMAR, S. SMITH, AND H. M. BARNES. 1993. Treatment of

Creator:: Kim, Gyu Hyeok and Morrell, Jeffrey J.
Abstract:: Supercritical fluids can markedly enhance preservative treatment of wood, but the high pressures employed can lead to collapse. We investigated the effects of the rates of pressure application and release on displacement of white spruce lumber during supercritical impregnation with carbon dioxide. Displacement was greatest when pressure was rapidly increased...
Resource Type:: Article
Full Text:: . KUMAR. E. SAHLE DEMESSIE. K. L. LEVIEN, ANI) J. J. M ~ R R E L L . 1997. Bending properties of TCMTB

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:: , J. J., K. L. LEVIEN, E. SAHLE DEMESSIE, S. KA- MAR, S. SMITH, AND H. M. BARNES. 1993. Treatment of

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:: solution (Sahle-Demessie 1994). The biocide-laden mixture was then introduced into the treatment vessel

Creator:: Morrell, Jeffrey J., Corden, M. E. (Malcolm E.), and Oregon State University. Department of Forest Products
Abstract:: Evaluations of previously established field trials indicate that chioropicrin, and Vorlex continue to provide protection to Douglas-fir poles, although the degree of protection is diminishing. Reapplication of Vapam 18 years after the initial application eliminated fungi which had recolonized the poles. Methylisothiocyanate (MITC) continues to protect Douglas-fir poles 12 years...
Resource Type:: Technical Report
Full Text:: Service (Forest Pathologist) W. E. Eslyn, U.S. Forest Products Laboratory (Forest Products Pathologist

Creator:: Morrell, Jeffrey J. and Oregon State University. Forest Research Laboratory
Abstract:: The specification, inspection, and remedial treatment of utility poles are addressed. Included are discussions of enhancing specifications for improved performance, techniques for detecting decay and other defects, and chemical treatments available for arresting decay of poles in service.
Resource Type:: Technical Report

Creator:: Oregon State University. Forest Research Laboratory
Abstract:: For the most recent issue please visit http://wwwdata.forestry.oregonstate.edu/forestry/pubs/frl/byyear.asp
Resource Type:: Other
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