We modeled patch occupancy to examine factors that best predicted the prevalence of four functionally important focal stream consumers (Tallaperla spp., Cambarus spp., Pleurocera proxima, and Cottus bairdi) among 37 reaches within the Little Tennessee River basin of the southern Appalachian Mountains, USA. We compared 34 models of patch occupancy...
In the late 1950s, "two California men" came to Oregon to learn if there were abalone here, and found them in the southern part of the state. The resulting publicity and interest inspired this document, an attempt to develop regulations for a new fishery. It is an internal discussion paper...
It is often necessary in communication systems to detect very
small signals that are buried in noise. One device used to accomplish
this is a lock-in amplifier. Initially the theory of operation is considered.
Then the circuit design of a low cost lock-in amplifier is
given. The amplifier, employing linear...
The objective of this project was to investigate technical efficiency and productivity growth in the Pacific Northwest sawmilling industry over the period 1968-2002. Productivity growth was decomposed into three components: technical change, efficiency change, and scale efficiency change. In addition, using econometric methods, changes in output elasticities and input substitution...
Effluent from an anaerobic swine manure lagoon was applied at
the upper end of six, 100 feet (30.5 m) long by 3 feet (0.9m) wide,
grass-covered plots which sloped about 3 percent. The objectives were
to measure concentration attenuation and mass reduction of potential
pollutants in the wastewater as the...
The electrical output of solar panels is reduced when dust covers the panels, but the air movement produced by a flying drone can be used to remove this debris. This research project will study the effectiveness of a quadcopter drone in dusting a solar panel. A solar panel was covered...
Scientists at EPA’s National Health and Environmental Effects Research Laboratory, Western Ecology Division (WED) have been studying seafloor (benthic) habitats in Yaquina estuary for several years. Those studies were conducted as parts of several research projects, including: effects of contaminated sediments on benthic invertebrates, effects of nutrient enrichment on estuarine...
An operator calculus for transforming assignment statements, loops, and choice constructs into equation-of-state expressions is shown to be powerful enough to synthetically execute a given computer program and its test data. A demonstration of the program is equivalent to applying an operator formalism to the equation-of-state in order to reduce...