Shovel logging is a relatively new ground-based method of yarding tinther. It involves moving logs from stump to landing by successive swinging with a hydraulic excavator modified into a log loader by replacing the shovel bucket with a grapple. Loaders used in shovel yarding can weigh in excess of 100,000...
The purpose of this dissertation is to investigate Oregon public high school history teacher perspectives concerning standards-based reform initiatives springing from the No Child Left Behind legislation. The central question addressed in this study is: At what level has Standards-Based Education reform initiatives impacted Oregon high school history instruction and...
Polynuclear aromatic hydrocarbons (PNAH) classified as noncarcinogens
may be photooxidized to mutagenic or toxic products by
near-ultraviolet (NUV) wavelengths of sunlight (290-320 nm). The
possibility that this represents a major degredation pathway in the
aquatic environment is of increasing concern. Large quantities of
PNAH from accidental oil spills, anthropogenic and...
Spotted knapweed, Centaurea maculosa Lam. (Compositae) is an extremely
successful introduced weed species in the northwestern United States. Multiple factors
may be responsible for its success, including chemical defense. Two different types of
putative chemical defense agents are the focus of this thesis. The first is a bitter-tasting
sesquiterpene lactone,...
This thesis focuses on two aspects of transparent electronics, SnO₂ transparent thin-film transistors (TTFTs) and transparent circuits. Both depletion- and enhancement-mode SnO₂ TTFTs are realized. The maximum effective mobility for the depletion- and enhancement-mode devices are 2 cm²V⁻¹s⁻¹ and 0.8 cm²V⁻¹s⁻¹, respectively. A variety of techniques to decrease the carrier...
The French Norway lobster (Nephrops norvegicus) fishery is composed by almost 250 beam trawlers, mainly registered in nine different harbours disseminated from South Brittany to Oléron Island. Even if the main target is Norway Lobster, these fishermen also catch juvenile Hake, Sole and other commercial fishes. Both Norway Lobster and...
Pinyon-juniper woodlands throughout the western U.S. have expanded rapidly following European settlement during the late 19th century. In central and eastern Oregon, western juniper (Juniperus occidentalis var. occidentalis Hook.) encroachment has been previously documented in the sagebrush steppe and upper elevation aspen communities. While these vegetation changes and dynamics have...
Since the early 1950's, the distribution of sediment at the
mouth of Redwood Creek has been altered by the effects of channel
aggradation and channelization along the lower reach. Severe flooding
in 1953, 1955, and 1964 caused bank erosion, landsliding, and
channel geometry changes along Redwood Creek. The increased sediment...
En vertu du principe de préservation des stocks naturels et au delà, de la viabilité d'une industrie des pêches, l'attention des pouvoirs publics est, à l'heure actuelle, essentiellement portée sur la diminution des capacités de production[1]. Une mesure globale de ces capacités de production mises en oeuvre pour la capture...