Browsing ETDs: Virginia Tech Electronic Theses and Dissertations by Title
Now showing items 6469-6488 of 33931
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D-branes and K-homology
(Virginia Tech, 2013-04-19)In this thesis the close relationship between the topological $K$-homology group of the spacetime manifold $X$ of string theory and D-branes in string theory is examined. An element of the $K$-homology group is given by ... -
D-glucaric acid excretion: its positive association with gender, tobacco, caffeine, marijuana, and vegetarianism in humans
(Virginia Polytechnic Institute and State University, 1982) -
D-q impedance identification in three phase systems using multi-tone perturbation
(Virginia Tech, 2013-05-31)In electric power systems, the existence of constant power loads such as output-regulated power converters may bring instability problem to AC or DC distributed systems. Impedance based stability criteria has been proven ... -
DACS: an interactive computer program to aid in the design and analysis of linear control systems
(Virginia Polytechnic Institute and State University, 1985) -
Daily ration, feeding periodicity and prey selection of sauger (Stizostedion canadense) in the Ohio River
(Virginia Polytechnic Institute and State University, 1982) -
Daily Self-Monitoring During the Winter Holiday Period: A Strategy for Holiday Weight Maintenance in Reduced-Obese Older Adults?
(Virginia Tech, 2011-02-23)Weight management is problematic among Americans, as the number of overweight adults has risen to two-thirds of the population (1). Without the identification of successful approaches to promote weight stability, it is ... -
Dairy Food Consumption in Educated, Older Women in Virginia: Use of Focus Groups to Examine Attitudes and Perceptions
(Virginia Tech, 1997-09-04)National studies indicate that older women have a suboptimal intake of calcium, and are not consuming the recommended daily servings of dairy foods. Three focus groups of 5-10 women were conducted to examine older women’s ... -
Dairy rations for Virginia
(Virginia Agricultural and Mechanical College and Polytechnic Institute, 1923) -
A Dam Conundrum: The Role of Impoundments in Stream Flow Alteration
(Virginia Tech, 2018-09-12)Over the past century, the world's rivers have become increasingly impounded to combat water scarcity and fossil-fuel reliance. Large dams have faded from popularity due to their adverse environmental effects, but small ... -
Damage analysis and mechanical response of as-received and heat-treated Nicalon/CAS-II glass-ceramic matrix composites
(Virginia Tech, 1993-04-05)Experimental results of damage development in and mechanical response of heat-treated NicaloniCAS-II laminates subjected to monotonic flexure and axial loading and to cyclic tensile loading are reported. The specimens were ... -
Damage Detection Based on the Geometric Interpretation of the Eigenvalue Problem
(Virginia Tech, 1997-12-09)A method that can be used to detect damage in structures is developed. This method is based on the convexity of the geometric interpretation of the eigenvalue problem for undamped positive definite systems. The damage ... -
Damage Detection in Aluminum Cylinders Using Modal Analysis
(Virginia Tech, 2002-07-31)Many studies have attempted to detect structural damage by examining differences in the frequency response functions of a structure before and after damage. In an experimental setting, this variation can not be attributed ... -
Damage Development in Static and Dynamic Deformations of Fiber-Reinforced Composite Plates
(Virginia Tech, 2005-12-13)A three-dimensional finite element code to analyze coupled thermomechanical deformations of composites has been developed. It incorporates geometric nonlinearities, delamination between adjoining layers, and damage due to ... -
Damage identification using inductive learning
(Virginia Tech, 1994) -
Damage Reduction Strategies for a Falling Humanoid Robot
(Virginia Tech, 2017-08-29)Instability of humanoid robots is a common problem, especially given external disturbances or difficult terrain. Even with the robustness of most whole body controllers, instability is inevitable given the right conditions. ... -
Dammed If You Don't: The Palmertown Tragedy of 1924 in Collective Memory
(Virginia Tech, 2016-06-24)On December 24, 1924, a wall of water and alkali muck engulfed Palmertown, a small community in Saltville, Virginia. Houses were swept away and by the time all of the bodies were pulled from the wreckage, the death toll ... -
Damorheology: creep-fatigue interaction in composite materials
(Virginia Tech, 1990-06-01)This investigation addresses the interaction mechanisms of time dependent material behavior and cyclic damage during fatigue loading of fiber reinforced composite laminates. A new term 'damorheology' has been coined to ... -
Damping Behavior in Ferroelectric Reinforced Metal Matrix Composites
(Virginia Tech, 2005-04-29)Ferroelectric-reinforced metal matrix composites (FR-MMCs) show promise as high damping materials for structural applications. Most structural materials are valued based on their stiffness and strength; however, stiff ...
