Diode lasers have many advantages such as small size, high efficiency and small
angular dispersion of the collimated beam. However they also have some problems like
lack of frequency stability. They can not be tuned in wavelength. An external cavity can
solve these problems and decrease the laser linewidth.
To...
To better understand the impact of land use on stream nutrient export, a synoptic sampling of 57 sub-basins within the Willamette River basin was conducted during winter baseflow conditions (February 2009). I assessed whether stream dissolved organic carbon (DOC), NO₃⁻ and Cl⁻ and specific ultra-violet absorbance (SUVA) values were correlated...
The enclosed thesis presents an algorithm, programmed
in FORTRAN IV, which generates the radii for
the objective of an astronomical refracting telescope.
The results are analyzed by the Trigonometric Ray
Trace, and found to have tolerable amounts of spherical
aberration, chromatic aberration and coma.
Imperfections in semiconductor materials constitute a rich area for research. The importance of the characterization of these imperfections cannot be understated. Junction spectroscopic techniques provide a unique tool for the study of these imperfections. The test specimens could consist of Schottky barrier, p-n junctions, or MOS structures. Using Schottky barrier...
Recent climate projections predict more frequent and severe drought conditions in western Oregon which is a threat to forest health, productivity, and structure. Land managers are increasingly concerned with how to create forest drought resistance: a tree or stand’s ability to maintain its growth rates during a drought, and resilience:...
In 2007, the City of Corvallis was issued a Phase II NPDES permit from the Oregon Department of Environmental Quality for non-point source pollution. In Corvallis, the majority of the stormwater conveyance system is separate from the sanitary sewer system. During a rain event, stormwater flows through pipes or over...
Vernal pools are ephemeral surface water wetlands with unique hydrology, ecology and species composition. Rare and endemic species rely on vernal pool habitat due to specialization traits the species possess because they are adapted to the extreme conditions. Many vernal pool basins have been topographically and hydrologically altered and are...
The sea offers a wide variety of potentially useful resources. Marine algae have been a rich source of structurally unique natural products showing diverse biological properties. The current need to develop new antifungal, antibiotic, anticancer and antiviral drugs has prompted intense research efforts into the discovery, isolation and structure determination...
Climate change, combined with population growth, is expected to exacerbate water scarcity globally. In the Columbia River basin (CRB), streamflow is managed for multiple objectives with a network of dams and reservoirs distributed throughout the basin that may mitigate climate change effects on water scarcity. This study quantified trends in...
This thesis presents the creep properties and the relations
between stress and strain of "Expanded 460KV", "Chukar" and
"Drake" conductors. The basic theories of the effect of load,
material, and temperature on the conductor are also briefly
discussed.
The long time creep curve of a conductor appears as a
straight...