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VTETD 檢索結果共 19439 筆,本頁資料從第 61 筆到第 72 筆

The American Society of Heating, Refrigerating and Air conditioning Engineers suggests that the building sector represents over 30 percent of our national energy consumption (Parsons, R., 2001). Embodied energy in components of building construction can represent as much as five to ten years of operating energy. Building materials such as concrete, steel and glass requi....

By Vidya Gowda-Architecture-VT-masters-2014-04-11
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Transition is an important phenomenon in large scale, commercial, wind tunnel testing at low speeds because it is an excellent indicator of an airfoil performance. It is difficult to estimate transition through numerical techniques because of the complex nature of viscous flow. Therefore experimental techniques can be essential. Over the transition region the rate of he....

By Liselle AnnMarie Joseph-Aerospace and Ocean Engineering-VT-masters-2014-03-26
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Since the discovery of superconductivity, its fantastic properties have fascinated the scientific community. The discovery of high critical temperature (Tc) superconducting compositions further inspires the wide applications of superconductors with relatively inexpensive liquid nitrogen cooling. Recently, the integration of superconductivity and optical waveguides has p....

By Yongxuan Liang-Materials Science and Engineering-VT-masters-2014-02-24
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Electrical properties of Si- and Mg-doped InAs epitaxial layers grown by MOCVD were studied by performing magneto-transport measurements at different temperatures, from 300 K down to 1.2 K. The longitudinal magnetoresistance and Hall effect indicate a three-band system existing in n-type (p-type) InAs, which consists of the surface accumulation (inversion) layer, the bu....

By Yao Zhang-Electrical and Computer Engineering-VT-masters-2014-02-07
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Brillouin scattering has been verified to be an effective mechanism in temperature and strain sensing. This kind of sensors can be applied to civil structural monitoring of pipelines, railroads, and other industries for disaster prevention. This thesis first presents a novel fiber sensing scheme for long-span fully-distributed pressure measurement based on Brillouin sca....

By jing wang -Electrical and Computer Engineering-VT-masters-2014-02-04
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Wavelet intensity based algorithm developed previously at VirginiaTech has been furthered and paired with an SVM based classifier. The wavelet intensity algorithm acts as a feature extraction algorithm. The wavelet transform is an effective tool as it allows one to narrow down upon the transient, high frequency events and is able to tell their exact location in time. Ac....

By Sreyoshi Bhaduri-Mechanical Engineering-VT-masters-2014-02-04
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During recent decades metallic nanoparticles have been found very interesting due to their unique characteristics which make them suitable for different applications. In this research, for the very first time, we tried to perform selective surface photo activation chemistry on the targeted facets of nanoparticles while they are in suspension. This technique enabled us t....

By seyyed mohammad hossein abtahi-Chemical Engineering-VT-masters-2014-01-30
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The decision regarding when and to what extent to use convenience food products is a perennial issue in the hospitality industry. Despite the pertinence of this issue in the industry, it has never been explicitly examined in the hospitality literature. Potential advantages of adopting convenience food products in food-service operations include: savings in time and cost....

By Ioana Dallinger-Hospitality and Tourism Management-VT-masters-2014-01-24
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Finger gesture recognition using glove-like interfaces are very accurate for sensing individual finger positions by employing a gamut of sensors. However, for the same reason, they are also very costly, cumbersome and unaesthetic for use in artistic scenarios such as gesture based music composition platforms like Virginia Techâs Linux Laptop Orchestra. Wearable computi....

By Deba Pratim Saha-Electrical and Computer Engineering-VT-masters-2014-01-22
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The research presented in this thesis aims to improve the knowledge of head impact biomechanics in youth football players by analyzing head impact exposure of youth football players and the performance of youth football helmets. The results of the studies presented provide a foundation for researchers, football leagues, and helmet manufactures to implement changes and m....

By Tyler James Young-Biomedical Engineering-VT-masters-2014-01-10
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Cellulose and hemicelluloses have attracted increasing interest as renewable biopolymers because of their abundance. Furthermore, the recognition of biomass as a sustainable and renewable source of biofuels has driven research into the assembly and disassembly of polymers within plant cell walls. Cellulose thin films are useful in the study of interactions between cell....

By Ying Ni-Chemistry-VT-masters-2014-01-10
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Protection of critical national infrastructure has received signiï¬cant attention in the past recent years. As a result, researchers have developed methods to preserve and maintain critical infrastructure systems and minimize their vulnerability to disasters and disruptions. However, these models are often customized to meet the characteristics and functionality requi....

By Mohammad Saied Dehghani Sanij-Industrial and Systems Engineering-VT-masters-2014-01-10
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