Browsing ETDs: Virginia Tech Electronic Theses and Dissertations by Title
Now showing items 17064-17083 of 38056
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H-Infinity Norm Calculation via a State Space Formulation
(Virginia Tech, 2013-01-21)There is much interest in the design of feedback controllers for linear systems that minimize the H-infty norm of a specific closed-loop transfer function. The H-infty optimization problem initiated by Zames (1981), ... -
H∞ and LQG optimal control for the rejection of persistent disturbances: analysis, design and experiment
(Virginia Tech, 1992-02-05)This dissertation presents a discussion of the asymptotic behavior and estimation structure of the H∞ central controllers in terms of the well-known behavior of the LQG controller and gives some insight into the ... -
Habitable Walls, Courtyard Homes in Urban Places
(Virginia Tech, 2000-01-12)In the United States, the living urban environment in the last two centuries has almost completely disappeared. Dense urban environments as viable and normal places to live have become a thing of the past. Living in the ... -
Habitat and host plant effects on the seasonal abundance of Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) among fruit orchards in northern Virginia
(Virginia Tech, 2021-04-02)Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), brown marmorated stink bug, is an invasive, polyphagous pest that has disrupted integrated pest management programs in Mid-Atlantic tree fruit orchards since 2010. The ... -
Habitat and Imperilment of the Candy Darter Etheostoma osburni in the New River Drainage, USA
(Virginia Tech, 2018-02-05)The streams of the southeastern United States are both hotspots for biodiversity and centers of imperilment. The specific spatiotemporal scales at which stressors impact biota are often unknown, partly due to inadequate ... -
Habitat and population dynamics of wolves and blackbuck in Velavadar National Park, Gujarat
(Virginia Tech, 1991-04-05)The management problem of allocating limited resources for conflicting habitat needs of 2 endangered species, (the wolf (Canis lupus pallipes) and the blackbuck (Antelope cervicapra)) at Velavadar National ... -
Habitat Associations and Demography of Small Mammals in 4 Forest Cover Types on Quantico Marine Corps Base, Virginia
(Virginia Tech, 1998-08-20)I examined small mammal demography and habitat associations in 4 forest cover types on Quantico Marine Corps Base, VA. Study sites included clearcut, shelterwood, mature-riparian, and mature-upland habitats. My primary ... -
Habitat Conservation Plan Implementation: Keeping Promises for Adaptive Management Within a "No Surprises" Policy
(Virginia Tech, 2005-10-21)Adaptive management is an approach to problem solving that acknowledges uncertainty. Adaptive management involves a systematic and rigorous process of learning from the outcomes of management actions, accommodating change ... -
Habitat conservation planning under the Endangered Species Act: is it ecosystem management?
(Virginia Tech, 1995-05-15)Habitat conservation planning under the Endangered Species Act has been compared to ecosystem management by Secretary of Interior, Bruce Babbitt. Yet, ecosystem management, an emerging paradigm for public lands management, ... -
The Habitat Ecology of Bog Turtles (clemmys Muhlenbergii) in Southwestern Virginia
(Virginia Tech, 1997-06-24)I radiotracked 31 bog turtles (Clemmys muhlenbergii) from May 1995 to December 1996 at 4 study areas in southwestern Virginia. Radio location data were used to provide measures of annual activity, spatial distributions ... -
Habitat evaluation and production of rock bass in two Virginia streams
(Virginia Polytechnic Institute and State University, 1985)The use of Habitat Suitability Index (HSI) models for fisheries impact assessment has not been field validated for most fish species. This research sought to test several of the fundamental assumptions inherent in applications ... -
Habitat models for predicting the occurrence of blotchside logperch (Percina burtoni) and tangerine darters (P. aurantiaca) in the North Fork Holston River and Little River, Virginia
(Virginia Tech, 1994-08-05)Basin-wide visual estimation techniques developed in the Pacific Northwest for small streams were modified to survey about 180 river kilometers (rkm) of the North Fork Holston River and about 16 rkm of lower Little River ... -
Habitat preferences of the eastern fence lizard, Sceloporus undulatus, in southwestern Virginia
(Virginia Tech, 2007-05-04)Habitat preference of the eastern fence lizard, Sceloporus undulatus, was investigated in southwestern Virginia. Habitat features were measured at 158 lizard-centered plots and at paired random plots. Landscape-level ... -
Habitat Relationships and Life History of the Rota Bridled White-eye (Zosterops rotensis)
(Virginia Tech, 2000-09-01)The Rota bridled white-eye (Zosterops rotensis)(Aves, Passeriformes) has experienced a severe population decline and range restriction over the last four decades. Little is known about this species and factors involved ... -
Habitat relationships for alewives and blueback herring in a Virginia stream
(Virginia Tech, 1993)The relationships between watershed characteristics and stream use by spawning alewife (Alosa pseudoharengus) and blueback herring (Alosa aestivalis) in the Rappahannock River drainage were identified. Trends in fish use ... -
Habitat relationships of bobwhite quail and cottontail rabbits on agricultural lands in Halifax County, Virginia
(Virginia Tech, 1988-11-09)I examined the relationships of quail and rabbits to agricultural land uses in the Virginia Piedmont during 1986-1987. Bobwhites and cottontails were censused and the associated habitat components quantified at 2 scales: ... -
Habitat Requirements and Foraging Ecology of the Madagascar Fish-Eagle
(Virginia Tech, 1997-05-06)With a population estimate of 99 pairs, the Madagascar fish-eagle (Haliaeetus vociferoides) is one of the rarest birds of prey in the world. I investigated the ecological requirements of the Madagascar fish-eagle in 1994 ... -
Habitat selection, food availability, and reproductive success of southwestern willow flycatchers on the South Fork Kern River, California
(Virginia Tech, 2004-01-07)The southwestern willow flycatcher (Empidonax traillii extimus) is a federally-endangered neotropical migrant that breeds in the southwestern United States. The population of southwestern willow flycatchers on the South ... -
Habitat suitability and population characteristics of smallmouth bass and rock bass in the Powell River, Virginia
(Virginia Tech, 1994-05-15)A survey of the population characteristics of smallmouth bass (Micropterus dolomieu), rock bass (Ambloplites rupestris), and habitat conditions were conducted in the Powell River, Virginia, to identify potential habitat ... -
Habitat tools for assessing instream-flow needs for fishes in the upper Roanoke River, Virginia
(Virginia Tech, 1994-02-01)The goal of this research was to formulate new tools for instream-flow analyses, with emphasis on protecting fish assemblages in speciose, warmer-water streams. This included habitat and fish data sets for the upper Roanoke ...
