Digital Commons Network^™

An Experimental Study Of Low Speed Open Cavity Flows, Abraham J. Meganathan

Masters Theses

The experimental work is part of an ongoing study aimed at understanding and controlling of cavity instabilities by passive or active steady or unsteady fluid injection. An experimental setup has been designed to quantitatively visualize the flow-field inside the cavity for varying relative dimensions (L/D ratios of 2.0, 2.67, 3.5 and 4.5, W/D of 3.33) at low subsonic speeds ranging from 55 ft/sec to 214 ft/sec using Particle Image Velocimetry (PIV).

The results showed that PIV could provide instantaneous velocity and other flow field data inside and above the cavity. The quality of data is good and may be used …

A Methodology And Sampling System For Monitoring Nonpoint Source Pollution From Land Uses, Bryan Fleet Staley

Masters Theses

Limited research has been done in developing a nonpoint source methodology and monitoring system that enables the quantitative evaluation of land use impacts on water quality in a single watershed. The development of a methodology and sampling system that specifically targets the runoff component of streamflow is important in determining which types of land uses contribute most to water quality degradation. In addition, an established monitoring strategy and sampling system will provide for the collection of water quality data when the pollution potential is greatest.

Both a monitoring methodology and a computer controlled sampling system have been developed that utilize …

An Evaluation Of Relationships Among Streamflow And Selected Water Quality Parameters In A Forested High-Altitude Watershed, Molly Sarah Mccann

Masters Theses

A long-term water quality program has been established at the Noland Divide Watershed (NDW) in the Great Smoky Mountains National Park. The Noland Divide Watershed is a spruce-fir forested catchment which has been shown in previous research to receive some of the largest fluxes of atmospherically-deposited nitrogen and sulfur compounds in the world. Streamwater chemistry data from November 1991 through August 1998 for two streams, the "northeast" (NE) and "southwest" (SW) stream, were examined to note results of this deposition on water quality. Automatic monitoring equipment on both streams measure and record pH, conductivity, and temperature readings every 15 minutes, …

Layer Properties Of Oriented Strandboard, Caryn Steidl

Masters Theses

It is well known that the density varies through the thickness of oriented strandboard, with the face being much denser than the core. Hence, the modulus of elasticity and the strength should vary through the thickness. To determine the variation in these properties through the thickness of the panel, a commercial oriented strandboard panel was sliced into fifteen layers to obtain specimens for tension and compression testing. Using multiple saw blades and spacers mounted on an arbor in a milling machine, thin specimens were obtained both perpendicular and parallel to panel length. The specimens were tested in tension using straight-sided …

Internal Forces In A Reinforced Concrete Box Culvert, Scott Mitchell Wood

Masters Theses

In 1996, a reinforced concrete box culvert with approximately 19 meters of embankment fill was instrumented with strain gages and pressure cells to determine the internal forces applied to the culvert. Strain and pressure readings were taken for a period of 3 years during and after the construction of the embankment. From a knowledge of the culvert's dimensions and material properties, the strain readings were converted to forces and bending moments. These forces were then compared to the allowable criteria from the American Association of State Highway and Transportation Officials (AASHTO) Standard Specifications for Highway Bridges. A computer model of …