In this study we present 42 new ⁴⁰Ar/³⁹Ar incremental heating age determinations updated age progression for the Louisville seamount trail. Louisville is the South Hawaiian‐Emperor seamount trail, both trails representing intraplate volcanism (~80 Ma to present) and being examples of primary hot spot lineaments. Our age‐progressive trend from 71 to...
Dry land agriculture using summer fallow is a common crop production
practice in the Columbia Plateau region of eastern Oregon. Farmed-over level
terraces are used to control surface water runoff and soil erosion. More than
70 percent of the average annual precipitation around Pendleton, Oregon (350 -
400 mm) falls...
With the current pressure for increased growth, the affects of climatic forcing events
pose serious threats to Oregon's Coastal Communities. Mathematical methods have been
implemented to establish setback distances for development adjacent to littoral cells.
Using formulae developed by the Coastal Construction Setback Taskforce (CCST) under
the Oregon Coastal Management...
Ceramides are a group of lipids in the sphingolipid family that are potent cell signaling molecules. Elevations in ceramide levels above the norm generally lead to apoptosis. Evidence from in vitro studies suggests that accumulation of ceramides within mitochondria leads to dysfunction of the mitochondria. This includes inhibition of the...
I studied selection of winter den sites by northern flying squirrels (Glaucomys sabrinus) in forests of the Oregon Cascades. Fifty-six squirrels were radio-collared in three managed, 80- to 1 30-year-old Douglas-fir stands on the Umpqua Nationa Forest during the winters of 1994-95 and 1995-96. Squirrels were located at their den...
Red oak, Douglas-fir, and ponderosa pine lumber was treated with a silicon/paraffinic system to assess the ability of the treatment to limit dimensional changes and moisture uptake during changes in temperature or relative humidity. The treatment initially had little effect on either property, but the magnitude of weight gain and...
The effect of metal end plates on reducing checking of pentachlorophenol-treated Douglas-fir crossarms was evaluated over 13 wet–dry cycles. Check development was variable over the first three to four cycles, and then steadily increased for both plated and nonplated ends of arms; however, both the number of checks and the...
Routine inspection of wood utility poles to detect internal decay involves drilling holes at or about the ground line. While these holes are useful for detecting internal decay, their presence raises concern among engineers about their potential effects on pole flexural properties. The effect of inspection holes on flexural properties...
Highway stormwater runoff represents a significant source of dissolved copper to surface
waters. It is well established that even low concentrations of dissolved copper can be toxic to many
aquatic organisms. In the Pacific Northwest of the United States, recent research has focused on the
effects of low-level copper exposure...
The effect of copper naphthenate treatment on electrical resistance of Douglas-fir utility poles was compared with similar
poles either left untreated or treated with pentachlorophenol (penta). Penta-treated and untreated wood had similar electrical
resistance shortly after treatment and after a 3-month outdoor weathering period. Electrical resistance of copper naphthenate–
treated...
