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Filtering by: Creator Jaeger, William K. Remove constraint Creator: Jaeger, William K. Committee Member Warnes, William H. Remove constraint Committee Member: Warnes, William H.

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  • Effects of doping, cation stoichiometry, and the processing conditions on the dielectric properties of high-K CaCu₃Ti₄O₁₂ ceramics

    Creator:
    Kwon, Seunghwa
    Abstract:
    Since its discovery, the anomalous dielectric behavior of CaCu₃Ti₄O₁₂ (CCTO) has drawn a great deal of attention for many possible applications in electronic devices. The origin of the giant dielectric constant in CCTO was explained via an internal barrier layer capacitor model, and it has been reported that the dielectric...
    Resource Type:
    Dissertation
    Full Text:
    Dielectric Properties of High-K CaCu3Ti4O12 Ceramics Abstract approved

  • An efficient frequency controlled PFM for DC-DC converters

    Creator:
    Pai, Jeff
    Abstract:
    As more features are being integrated into mobile platforms, the demand for long battery life during standby mode has been increasing. Light load efficiency becomes one of essential features in today's DC-DC converter. The most effective method to improve light load efficiency is to operate the DC-DC converter under pulse-frequency-modulation...
    Resource Type:
    Masters Thesis
    Full Text:
    Hamdaoui, Thinh Nguyen, and William H. Warnes for taking their time to serve as my MS oral examination

  • Development of an economical high temperature microchannel recuperator for solid oxide fuel cells

    Creator:
    Brannon, Samuel T.
    Abstract:
    To improve the performance of solid oxide fuel cells, a secondary power cycle can be driven by the recuperation of exhaust gas heat. Microchannel recuperators are attractive for waste heat recuperation due to compact form factors which also minimize the mass of the expensive superalloys required. This paper introduces a...
    Resource Type:
    Masters Thesis
    Full Text:
    : ____________________________________________________________________ Brian K. Paul To improve the performance of solid oxide fuel cells, a secondary power

  • Influence of subset size, shape and orientation on texture based digital image correlation

    Creator:
    Cui, Jianqing
    Abstract:
    Digital Image Correlation(DIC) is one of full-field strain measurement techniques devel- oped in recent decades, which has been well-demonstrated to conduct the mechanical properties study of solid materials, by collecting data using digital cameras. X-ray to- mography(CT) imaging helps the correlation techniques expanded to three dimensional investigation of materials, known...
    Resource Type:
    Masters Thesis
    Full Text:
    Size, Shape and Orientation on Texture Based Digital Image Correlation Abstract approved: Brain K

  • Mechanical Behavior of Elastomer Polymer under Shear and Compression: Experimental Investigation Using Digital Image Correlation

    Creator:
    Raheem, Hassan M.
    Abstract:
    Due to their viscoelastic properties, polymers and hydrogels are widely used in many applications. In this study, the viscoelastic properties of elastomer polymers were investigated for a series of hydrogel, hydrogel composites and silicon materials. A primary application for hydrogels and hydrogel composites is as a replacement for the degenerated...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Brian K. Bay Skip E. Rochefort Due to their viscoelastic

  • Multiple Nonlinear Model Predictive Control for a Six-body System Oscillating Water Column Wave Energy Converters Array

    Creator:
    Xu, Zhicheng
    Abstract:
    This research presents the design of three nonlinear model predictive controllers (NMPCs) for floating oscillating water column (OWC) wave energy converters (WECs) array to maximize generated power, augmented with the control of the high-speed stop valves (HSSVs). Key to this design is the development of a high-fidelity discretized model for...
    Resource Type:
    Masters Thesis
    Full Text:
    Jinsub Kim, and graduate council representative, Prof. William H. Warnes. I truly appreciate the

  • Development of high efficiency solar absorbers

    Creator:
    Ravichandran, Ram
    Abstract:
    Current cadmium telluride and copper indium gallium diselenide thin-film solar cells (TFSCs) utilize thick absorbers (2 - 4 μm). For efficient carrier extraction in these TFSCs, the absorber layer requires high carrier mobilities and a long minority carrier lifetime, which necessitates the use of a high purity, defect-free thin film....
    Resource Type:
    Dissertation
    Full Text:
    many people in Corvallis who have helped me make OSU home, especially Dr. William Cowell, Ira Jewell

  • A study of compression loading of composite laminates

    Creator:
    Berbinau, Pierre J.
    Abstract:
    The compressive behavior of continuous fiber composites is not as well understood as their tensile behavior because research and industrial applications have until recently focused on the latter. Furthermore, most theoretical and experimental studies on the compression of composites have examined the case of unidirectional specimens with fibers along the...
    Resource Type:
    Dissertation
    Full Text:
    and analytical research skills. I would also like to thank Drs. Timothy C. Kennedy, William H

  • Processing of laser interferometric signals for small displacement measurements

    Creator:
    Peng, Gwo-sheng
    Abstract:
    Algorithms for analyzing laser interferometry signals were developed and adopted to the computer based processing of small displacement measurements. These methods, matrix operation approach and fixed parameters approach, are based on signal phase calculation and are able to replace complex fringe counting electronic circuits. The matrix operation provides an approach...
    Resource Type:
    Dissertation
    Full Text:
    . Thomas K. Plant, Dr. Timothy C. Kennedy and Dr. William H. Warnes for reviewing the dissertation and

  • Development and characterization of novel hydrogels for nucleus pulposus replacement

    Creator:
    Bader, Rebecca A.
    Abstract:
    Hydrogels have been proposed as candidates for nucleus pulposus replacement due to their similarity in mechanical behavior to the native tissue when subjected to transient or static loading; however, given the viscoelastic nature of soft biological tissues, the lack of dynamic testing is a significant inadequacy in the studies performed...
    Resource Type:
    Dissertation
    Full Text:
    scientist. Thank you Skip. Dr. William Warnes provided me with guidance on all written works and