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Propagation and Scattering of Waves by Terrain Features
(Virginia Tech, 2000-06-13)
The intent of this dissertation is to obtain estimates of the effects of natural terrain features on the propagation and scattering of waves. It begins with the rough knife obstruction case, moves into rough surfaces and ...
Alternative Responses to the Orange County Bankruptcy: An Inquiry into the Images Underlying Theory
(Virginia Tech, 2000-08-18)
The bankruptcy of the government of Orange County, California in 1994 is treated as a case study depicting a potentially critical problem emerging for democracies. The analysis links finan-cial and fiduciary perspectives ...
Active Flow Control For Reduction of Unsteady Stator-Rotor Interaction In a Turbofan Simulator
(Virginia Tech, 2000-10-10)
The research effort presented in this dissertation consists of employing active trailing edge blowing control to reduce the unsteady stator-rotor interaction in a turbofan simulator. Two active flow control systems ...
Analysis and Characterization of Fiber Nonlinearities with Deterministic and Stochastic Signal Sources
(Virginia Tech, 2000-02-10)
In this dissertation, various analytical models to characterize fiber nonlinearities have been applied, and the ranges of validity of the models are determined by comparing with numerical results.
First, the perturbation ...
Investigation of Inlet Guide Vane Wakes in a F109 Turbofan Engine with and without Flow Control
(Virginia Tech, 2000-08-17)
A series of experiments were conducted in a F109 turbofan engine to investigate the unsteady wake profiles of an Inlet Guide Vane (IGV) at a typical spacing to the downstream fan at subsonic and transonic relative blade ...
Gender Differences in Computer Attitudes, Interests, and Usage in an Elite High School
(Virginia Tech, 2000-06-01)
A descriptive case study examined the gender differences concerning computer technology (IT) by a convenience sample (N = 180, 76%) of 11 th and 12 th graders at an elite public high school, recently named the "second best ...
The Behavioral Ecology and Conservation of an Australian Passerine, the Brown Treecreeper (Climacteris picumnus)
(Virginia Tech, 2000-09-11)
This study addressed two aspects of ecological theory developed primarily in North America and examined these theories using an Australian passerine as a model species. The first theory concerns the mechanisms by which ...
Methods of Determining the Number of Clusters in a Data Set and a New Clustering Criterion
(Virginia Tech, 2005-11-28)
In cluster analysis, a fundamental problem is to determine the best estimate of the number of clusters, which has a deterministic effect on the clustering results. However, a limitation in current applications is that no ...
Improving Object Classification in X-ray Luggage Inspection
(Virginia Tech, 2000-02-22)
X-ray detection methods have increasingly been used as an effective means for the automatic detection of explosives. While a number of devices are now commercially available, most of these technologies are not yet mature. ...
Women Recreating their Lives: Challenges and Resilience in Midlife
(Virginia Tech, 2000-04-06)
This research explores how midlife women found the strength and resilience that enabled them to rebound and grow as they negotiated significant life challenges in their marriage, and with their children, parents, careers, ...