Search Constraints

Start Over
Filtering by: Creator Cowan, William C. Remove constraint Creator: Cowan, William C. Committee Member Warnes, William H. Remove constraint Committee Member: Warnes, William H.

Search Results

  • A model for waterside oxidation of zircaloy fuel cladding in pressurized water reactors

    Creator:
    Almarshad, Abdullah I. A.
    Abstract:
    A model has been developed to predict the long-term oxidation rate of Zircaloy-4 for ex-reactor (autoclave) and in-reactor (PWR) environments and operating conditions. A computer program has been written to solve the oxygen diffusion equation by employing a fully implicit finite difference method for a one dimensional cylindrical geometry. The...
    Resource Type:
    Dissertation
    Full Text:
    . Almarshad ACKNOWLEDGEMENT I am deeply grateful to my advisor, Dr. Andrew C. Klein for his advice

  • Failure analysis of pre-notched composite laminated plates under four-point bending conditions

    Creator:
    Arias Gonzales, Sergio
    Abstract:
    Ever since composite laminate technology was introduced into the aerospace and automotive industry, there has been a need to fully understand the damage progression experienced by composite laminated plates in the presence of a notch. While numerous research studies have been conducted on this matter when subjected to in-plane loads,...
    Resource Type:
    Dissertation
    Full Text:
    Bending Conditions Abstract approved: __________________________________________ Timothy C

  • Large-strain softening of aluminum in shear at elevated temperature

    Creator:
    Alhajeri, Saleh N.
    Abstract:
    Pure aluminum deformed in torsion (shear) at elevated temperatures reaches a broad "peak" stress and then undergoes about a 17% decrease in flow stress with deformation to roughly 1-2 equivalent uniaxial strain. Beyond this strain the flow stress is approximately constant. The sources for this softening are unclear. The suggested...
    Resource Type:
    Masters Thesis
    Full Text:
    . Timothy C. Kennedy, Dr. William H. Wames, and Dr. R. Logen Logendran. I appreciate their time investment

  • Comparison of HEU and LEU neutron spectra in irradiation facilities at the Oregon State TRIGA® reactor

    Creator:
    Schickler, Robert
    Abstract:
    In 2008, the Oregon State TRIGA® Reactor (OSTR) was converted from highly-enriched uranium (HEU) fuel lifetime improvement plan (FLIP) fuel to low-enriched uranium (LEU) fuel. This effort was driven and supported by the Department of Energy's (DoE's) Reduced Enrichment for Research and Test Reactors (RERTR) program. The basis behind the...
    Resource Type:
    Masters Thesis
    Full Text:
    characterization. I would like to thank my committee (Dr. Kenneth Krane, Dr. William Warnes, Dr. Andrew Klein

  • Energy Harvesting and Power Management Integrated Circuits for Self-Sustaining Wearables

    Creator:
    Bose, Soumya
    Abstract:
    Harvesting energy from ambient sources can provide power autonomy to energy efficient electronics and sensors. The last decade has seen a multitude of ways to scavenge energy from various sources like solar, thermal, electromagnetic, electrostatic, piezo-electric and many more. Thermal energy from human body heat is ubiquitous and can be...
    Resource Type:
    Dissertation
    Full Text:
    valuable inputs. I would also like to extend my thanks to Prof. William Warnes for serving as the Graduate

  • Sealed consolidation of natural fiber composites with chemical reactant injection and removal

    Creator:
    Chowdhury, Mohammed Jahangir Alam
    Resource Type:
    Dissertation
    Full Text:
    ) and then curing the resin by injecting methyl formate vapor at 40°C. For comparison, samples were

  • Design of Compact Passive Components and Circuits for RF and Millimeter-Wave Integrated Circuit in Silicon

    Creator:
    Dong, Xuanyi
    Abstract:
    Emerging fifth generation (5G) and beyond 5G communication networks are stimulating the design of radio-frequency (RF) and millimeter-wave (mmWave) integrated circuits for wireless transceivers systems. While co-integration of active circuits and diverse passive components becomes feasible at these high operating frequencies, circuit design is faced with significant challenges due to...
    Resource Type:
    Dissertation
    Full Text:
    proposed compact layout design approach in RF and mmWave applications. c©Copyright by Xuanyi Dong May

  • High-performance Ring Amplifier based Analog-to-Digital Converters

    Creator:
    Hu, Hang
    Abstract:
    Ring Amplifier serves as a great candidate both for precision amplification and fast integration in the discrete time system. It can be utilized in high-performance analog-to-digital converters (ADCs). In high-speed ADC utilizing pipelined architectures with residue amplification, Successive-Approximation Register (SAR) ADCs as the sub-ADC and power efficient Ring Amplifier based...
    Resource Type:
    Dissertation
    Full Text:
    committees Prof. Gabor Temes, Prof. Matthew Johnston, Prof. Tejasvi Anand and Prof. William H. Warnes for

  • Switch-capacitor Power Amplifier with Enhanced Power Back-off Efficiency and Linearity

    Creator:
    Qiao, Bo
    Abstract:
    Nowadays, wireless communication systems use high-order quadrature amplitude modulation (QAM) together with orthogonal frequency-division multiplexing (OFDM) to increase the link capacity and robustness. These signals always have large peak-to-average power ratio (PAPR) and require power amplifiers (PAs) achieve both high efficiency and linearity simultaneously. For the efficiency, the complementary metal...
    Resource Type:
    Dissertation
    Full Text:
    . Arun Natarajan, Prof. Gabor C. Temes and Prof. William H. Warnes for being committee members during

  • 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

  • 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

  • Excited state molecular structural evolution and chemical reactivity studied by femtosecond stimulated Raman spectroscopy

    Creator:
    Han, Fangyuan
    Abstract:
    In this dissertation, my research work on excited state dynamics of small organic molecules in solutions is presented. Using femtosecond stimulated Raman spectroscopy (FSRS) as the main experimental tool, the excited state hydrogen-bonding dynamics (ESHBD) of Coumarin 102, a common laser dye molecule, in ethanol solution is examined with <150...
    Resource Type:
    Dissertation
    Full Text:
    spectator mode, i.e. the C=O stretching mode, is examined within a 600 ps time window. The excited state

  • An enhanced swing differential Colpitts CMOS VCO for low-voltage operation

    Creator:
    Farahbakhshian, Farhad
    Abstract:
    An enhanced swing differential Colpitts VCO (ESDC-VCO) dramatically improves the swing of a Colpitts VCO by allowing the signal to swing below ground and above the supply voltage. Fabricated in a 1P8M 0.13 um CMOS process, the ESDC-VCO operates at 4.9GHz with a 0.475-V supply and consumes 2.7mW. The measured...
    Resource Type:
    Masters Thesis
    Full Text:
    the highest performing integrated LC oscillator to date. c©Copyright by Farhad Farahbakhshian

  • Computational Fluid Dynamics Modeling of the Density Evolution Inside of the Helium-3 Enhanced Negative Reactivity Insertion (HENRI) System

    Creator:
    Balderrama Prieto, Silvino Alejandro
    Abstract:
    The testing of nuclear fuel under reactivity-initiated accident (RIA) conditions is paramount for the better understanding of the fuel’s behavior during this transient accident events. The Transient Reactor Test (TREAT) facility is a nuclear reactor that will be capable of recreating the thermal-hydraulic and neutronic boundary conditions representative of RIA...
    Resource Type:
    Masters Thesis
    Full Text:
    APPENDIX C: GCI MATLAB Code ............................................................... 124

  • Development of new high-temperature piezoelectric perovskite ceramics

    Creator:
    Ansell, Troy Youngmin
    Abstract:
    Lead zirconate titanate (PZT) is the dominant ferroelectric material in the market due to its excellent piezoelectric properties, relatively high Curie transition temperature (T[subscript C]), low cost, etc. However, because of emerging applications with requirements for high temperature (T[subscript C] > 400 °C) ferroelectrics, researchers are increasingly looking at alternative...
    Resource Type:
    Dissertation
    Full Text:
    ) before, (b) during, and (c) after application of an electric field

  • Discrete trap modeling of thin-film transistors

    Creator:
    Yerubandi, Ganesh Chakravarthy
    Abstract:
    A discrete trap model is developed and employed for elucidation of thin-film transistor (TFT) device physics trends. An attractive feature of this model is that only two model parameters are required, the trap energy depth, E[subscript T], and the trap density, N[subscript T]. The most relevant trends occur when E[subscript...
    Resource Type:
    Masters Thesis
    Full Text:
    scheduled to attend my defense: Dr. Sivaramakrishnan Subramanian, Dr. Pallavi Dhagat and Dr. William H

  • Routerless Network-on-chip

    Creator:
    Alazemi, Fawaz
    Abstract:
    Traditional bus-based interconnects are simple and easy to implement, but the scalability is greatly limited. While router-based networks-on-chip (NoCs) offer superior scalability, they also incur significant power and area overhead due to complex router structures. In this thesis, a new class of on-chip networks, referred to as Routerless (RL) NoCs,...
    Resource Type:
    Dissertation
    Full Text:
    . Rakesh Bobba, and William H. Warnes. • Prof. Ziad Najem for being a role model. • Prof. Mehmet Karaata

  • A study of micro-scale, fractal-like branching flow networks for reduced pumping power and improved temperature uniformity

    Creator:
    Alharbi, Ali Y.
    Abstract:
    A first generation, one-dimensional predictive model is proposed for designing heat sinks with fractal flow networks. A three-dimensional computational fluid dynamics (CFD) model is analyzed as a means for validating the model and identifying areas for improvement. Two separate CFD models were developed. One was analyzed with conjugate heat transfer...
    Resource Type:
    Masters Thesis
    Full Text:
    my gratitude to my committee members, Dr. William Warnes, Dr. James Liburdy, and Dr. Robert Lawrence

  • 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

  • Threshold Selection Based on the SNR in Time of Arrival Localization System

    Creator:
    Lyu, Tao
    Abstract:
    Threshold-based time of arrival (TOA) estimation is a technique for high-precision indoor localization. Existing threshold selection methods, such as xed thresh- old and normalized threshold methods, do not consider the signal-to-noise radio (SNR) value at the receiver. This is not desired for high-precision positioning. A proper threshold value depends on...
    Resource Type:
    Masters Thesis
    Full Text:
    selection threshold method are compared. c©Copyright by Tao Lyu March 11, 2016 All Rights Reserved

  • Secrecy of massive MIMO systems under antenna failure

    Creator:
    Assiri, Mohammad
    Abstract:
    As the fifth generation of mobile communication systems (5G) is being deployed, massive multiple-input multiple-output (MIMO) serves as one of its enabling technologies where reliable and ultra low latency communications are achieved while being power and spectrum efficient. This thesis studies the security aspect of massive MIMO system from the...
    Resource Type:
    Dissertation
    Full Text:
    channels given that the channels of interfering users have distinct spatial characteristics. c

  • Influences of Replacing Cr with Mo in Fe25Co25Ni25Cr25-XMoX High Entropy Alloy Series on the Microstructure and Mechanical Properties

    Creator:
    Xu, Yifan
    Abstract:
    Fe25Co25Ni25Cr25-XMoX High Entropy Alloys were fabricated in mini arc-melter and then cast into 4mm diameter cylinders by injection casting technique and 1cm diameter cylinders by water quenching technique. Heat transfer modeling during solidification of FeCoNiCr HEA was simulated. Combining X-Ray Diffraction, Optical Microscopy, Scanning Electron Microscope, Energy Dispersive X-ray analysis,...
    Resource Type:
    Masters Thesis
    Full Text:
    ; (b) lattice sites with severe lattice distortion; (c) influence of temperature and distortion on

  • Simulations of geckos dry adhesion system

    Creator:
    Hu, Congcong
    Abstract:
    Simulation models were developed to explore the reversible nature of gecko dry adhesion system. The central idea of this model is that even with a small moment imparted on the contact tip, the seta can be easily ad-adhered. It is shown that this contact condition is very sensitive, but can...
    Resource Type:
    Masters Thesis
    Full Text:
    fibers or pillars with canted angles (Figure 1.3(c)), using hybrid materials and modifying the tip

  • Exploring IMU Attitude and Position Estimation for Improved Location in Indoor Environments

    Creator:
    Zhang, Shengkai
    Abstract:
    Wearable sensors with an inertial measurement unit (IMU) are popular for indoor positioning and activity pattern detection. The IMUs can be connected to a wireless transmission module, allowing users to monitor and process motion-related parameters remotely. Because of the complexity and uncertainty of signals in indoor environments, a radio frequency...
    Resource Type:
    Masters Thesis
    Full Text:
    robot and guide its moving directions. c©Copyright by Shengkai Zhang June 12, 2019 All Rights

  • UWB Low Power RF System for Localization

    Creator:
    Sheokand, Anoop
    Abstract:
    Real time indoor positioning awareness systems aim to add localization capabilities to upcoming wireless technologies that are quickly becoming an important feature for indoor environment. RF-based impulse-radio ultra-wideband (IR-UWB) is a promising technology for in-door positioning systems due to obstacle penetration capabilities, immunity to multi-path and fading, and high resolution....
    Resource Type:
    Masters Thesis
    Full Text:
    allowing for higher sensitivity with non-coherent RF receiver architecture. c©Copyright by Anoop

  • Synthesis, degradation and practical applications of a glycerol/citric acid condensation polymer

    Creator:
    Trenkel-Amoroso, Jan
    Abstract:
    This study looks at the properties of glycerol/citric acid as they are affected by the length and temperature of the bake used to facilitate the condensation reaction that creates the polymer. In particular, the length of time required for the polymer to break down in the presence of water, both...
    Resource Type:
    Masters Thesis
    Full Text:
      condensation reaction is:    ( ) ( ) ( )4 25OH H O+ +3 5 6 4 3 9 93 4C H OH C H O OH C H O    Thus more

  • Development of continental magmatic systems : insights from amphibole chemistry of the Altiplano Puna Volcanic Complex, Central Andes

    Creator:
    Abot, Manggon
    Abstract:
    The pressure history of a continental magmatic system can be deciphered by analyzing the composition of amphiboles in the eruptive products where the pressure of equilibration correlates with the depth of the magmatic system. This can reveal vertical evolution of the magma as amphibole composition varies significantly with temperature and...
    Resource Type:
    Masters Thesis
    Full Text:
    chemistry, and various aspects of this research. A special thank you to William H. Warnes for his

  • Prompt gamma neutron activation analysis of niobium for characterization of light interstitials

    Creator:
    Love, Ian J.
    Abstract:
    High purity niobium metal is used in the construction of superconducting radio frequency (SRF) cavities in superconducting particle accelerators, such as the Large Hadron Collider (LHC) at CERN or the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. The usual method for characterizing the impurities in this niobium, the...
    Resource Type:
    Masters Thesis
    Full Text:
    light interstitials (H, C, N, and O), and five “unknown” samples were analyzed to determine the

  • Graphite intercalation with fluoroanions by chemical and electrochemical methods

    Creator:
    Özmen Monkul, Bahar
    Abstract:
    New acceptor-type graphite intercalation compounds (GICs) containing perfluoroalkyl anions have been synthesized by using both chemical and electrochemical methods and characterized by elemental and thermogravimetric analyses. Investigation into these graphite intercalation compounds can provide novel materials and a detailed understanding of their properties. GICs of composition Cx[FB(C₂F₅)₃]·δF are prepared for...
    Resource Type:
    Dissertation
    Full Text:
    . I would like to thank Profs. William H. Warnes, John Simonsen, Staci L. Simonich, Yun-Shik Lee and

  • Printing 3D Magnetic Composite Structures with Arbitrary Anisotropy using UV-curable Magnetic Ink

    Creator:
    Clay, Garrett
    Abstract:
    Inkjet printing offers a cost effective, highly customizable method for rapid manufacturing of functional devices with minimal material waste. Although this method has been used for a variety of composites, little work has been done in the area of 3D printing magnetic composites. Presented here is a process for inkjet...
    Resource Type:
    Masters Thesis
    Full Text:
    the printhead. c) The chamber then refills, and the process repeats. . . 3 1.2 a) The thermal inkjet

  • An investigation of transition from penetration to deflection in the fracture of bi-material interfaces

    Creator:
    Strom, Joshua L.
    Abstract:
    The problem of determining whether a crack impinging on an interface will penetrate into the substrate or deflect along the interface is vital to the effective design of layered and composite material systems. Of particular interest is the transition between crack propagation by penetration through an interface and deflection along...
    Resource Type:
    Masters Thesis
    Full Text:
    APPENDIX C – LEFM Transition Curve Derivation ................................................. 68

  • Fabrication and characterization of thin-film transistor materials and devices

    Creator:
    Hong, David
    Abstract:
    A class of inorganic thin-film transistor (TFT) semiconductor materials has emerged involving oxides composed of post-transitional cations with (n-1)d¹⁰ns⁰ (n≥4) electronic configurations. This thesis is devoted to the pursuit of topics involving the development of these materials for TFT applications: Deposition of zinc oxide and zinc tin oxide semiconductor layers...
    Resource Type:
    Dissertation
    Full Text:
    , however the energy distribution of these states approaches that of a crystalline material. c©Copyright

  • Leveraging Multiple Transmissions and Receptions for Channel-Agnostic Wireless Device Identification

    Creator:
    Basha, Nora
    Abstract:
    Enabling accurate and automated identification of wireless devices is critical for ensuring secure and authenticated data communication in large-scale networks such as IoT networks. In the aim of devising practical identification techniques that are immune to spoofing, hardware-driven RF fingerprinting using deep neural networks, which leverages the inevitable presence of...
    Resource Type:
    Masters Thesis
    Full Text:
    matrix is given by: C = c1 −c∗2 c2 c ∗ 1  The two symbols c1 and c2 are transmitted from

  • Deletions and Insertions of the Symbol 0 and Asymmetric/Unidirectional Error Control Codes for the L₁ Metric

    Creator:
    Alqwaifly, Nawaf
    Abstract:
    This work gives some theory and efficient design of binary block codes capable of controlling the deletions of the symbol “0” (referred to as 0-deletions) and/or the insertions of the symbol “0” (referred to as 0-insertions). This problem of controlling 0-deletions and/or 0-insertions (referred to as symmetric 0-errors) is shown...
    Resource Type:
    Dissertation
    Full Text:
    Professor Ben Lee, Professor Thinh Nguyen, Professor Lizhong Chen, and Professor William Warnes for serving

  • Surface-Enhanced Infrared Absorption Gas Sensing Incorporating Advanced Plasmonic Nanostructures and Nano-Composite Materials

    Creator:
    Chong, Xinyuan
    Abstract:
    This dissertation focuses on extending the application scope of surface enhanced infrared absorption spectroscopy to gas sensing. The method we propose is incorporating plasmonic nanostructures with nano-composite material, metalorganic framework, which can selectively preconcentrate certain gas molecules into the nanopores. The preconcentrating property is first demonstrated by applying metal-organic framework...
    Resource Type:
    Dissertation
    Full Text:
    Larry Cheng, Professor Matthew Johnston and Professor William H. Warnes for serving as my committee

  • Plasma-Jet Printing and In Situ Sintering of Electronic Materials for Flexible Hybrid Electronic Applications

    Creator:
    Manzi, Jacob
    Abstract:
    Additive manufacturing has become a promising method for the fabrication of inexpensive, green, flexible sensors and electronics. Printed electronics on low- temperature substrates are very appealing for the flexible hybrid electronics market for their use in disposable and biocompatible electronic applications and in areas like packaging, wearables, and consumer electronics....
    Resource Type:
    Dissertation
    Full Text:
    ]. 5 Figure 3. (a) Plasma printer showing the print head; (b) Expanded view of the print head; (c

  • Information theoretic approach to quantization and classification for signal processing, communications, and machine learning applications

    Creator:
    Thuan Nguyen D.
    Abstract:
    There are five main contributions of this dissertation. The first contribution is new closed-form expressions for channel capacity of a new class of channel matrices. The second contribution is the discovery of the structure for optimal binary quantizer and the associated methods for finding an optimal quantizer that maximizes mutual...
    Resource Type:
    Dissertation
    Full Text:
    All Solutions to a∗ = c(a∗) . . . . . . . . 60 3.6 Conclusion

  • New Insights into Mantle Dynamics from Helium Isotopes and Argon Geochronology

    Creator:
    Konrad, Kevin
    Abstract:
    Earth’s mantle extends to nearly 3000 km depth, comprises >80 % of Earth’s total volume, and has the largest influence on the primordial and radiogenic heat budget. Despite its importance, the structure and composition of the mantle is still debated. There are three primary models for Earth’s mantle structure that...
    Resource Type:
    Dissertation
    Full Text:
    reproduced the observed relative motions. 1.5 References Allègre, C. J., Staudacher, T., Sarda, P

  • 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

  • An experimental study on tensile properties of cellulose nanocrystal reinforced epoxy nanocomposite material

    Creator:
    Zeng, Jin
    Abstract:
    Epoxy resin is a thermosetting resin that is commonly used as composite matrix. Epoxy composite materials are well utilized in industries, such as aerospace, due to their good mechanical properties. Nano-scale filler reinforced polymer composite materials have been intensively researched in recent decades. Cellulose nanocrystals (CNXLs) are a type of...
    Resource Type:
    Masters Thesis
    Full Text:
    , Dr. William H. Warnes, and Dr. Adam Z. Higgins for agreeing to serve in my academic committee and

  • Examining Wave Attenuation Rates and Subsurface Pore Pressures Across Three Marsh Restoration Sill Structures on a Sandy Bed

    Creator:
    Converse, Jordan D.
    Abstract:
    With rising sea levels and more frequent exposure to extreme storms, coastlines worldwide are vulnerable to increased erosion and loss of natural marsh lands. In an effort to lessen these impacts, there is a growing practice of adapting hard or “gray” coastline protection techniques to more nature-based features that promote...
    Resource Type:
    Masters Thesis
    Full Text:
    planting and b) intertidal oyster reef (C. S. Hardaway, Milligan, and Wilcox 2017; Piehler 2018

  • Nucleation Inhibiting Mechanisms in Atomic Layer Deposition of Nanolaminates

    Creator:
    Witsell, Shane Mike’ele Williama
    Abstract:
    Nucleation in atomic layer deposition (ALD) determines how many cycles are required to initiate growth and to form a continuous film. Nucleation has been exploited for the formation of nanoparticles, catalysts, and for area-selective ALD. Although sometimes overlooked or misrepresented in ALD reports, nucleation is also critical for multicomponent ALD...
    Resource Type:
    Masters Thesis
    Full Text:
    . John Labram, Prof. Li-Jing (Larry) Cheng, and my Graduate Council Representative, Prof. William (Bill

  • Indoor Localization Using Direction of Arrival Approach

    Creator:
    Zhang, Tingwei
    Abstract:
    In this paper, a Direction of Arrival (DOA) based system is proposed. This method searches the direction relative to the array to find where the signal source is located. The proposed system can achieve sub-meter level accuracy with a near real-time update rate. Also, we introduced several refinement methods including...
    Resource Type:
    Masters Thesis
    Full Text:
    , and the functionality of the refinement methods has been approved in the simulation. c©Copyright

  • Electronic Properties of Passive Films on Carbon Steel Rebar in Simulated Concrete Pore Solutions

    Creator:
    Williamson, Jon W.
    Abstract:
    In the highly alkaline environment of concrete, carbon steel rebar is protected against corrosion by a passive oxide/oxyhydroxide film. Understanding the characteristics of this passive film, and how it depassivates, is the key for mitigating problems associated with steel corrosion in concrete. Although a large number of electrochemical and analytical...
    Resource Type:
    Masters Thesis

  • 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:
    , typically between 600 and 1000[⁰C]. As a result, metallic components can be required which have stringent

  • New Architectures and Circuits for Pushing the Dynamic Range and Multiplexing Boundaries of CMOS-Integrated Sensors

    Creator:
    Ouh, Hyunkyu
    Abstract:
    Over the last decades, CMOS-integrated sensors have made impressive progress in performance, form-factor, and energy-efficiency for various applications such as imaging, physical/chemical sensing, bio/health monitoring. In the era of the artificial intelligence (AI) and the internet-of-things (IoT), such CMOS-integrated sensors are essential for massive and comprehensive data acquisition, where sensing...
    Resource Type:
    Dissertation
    Full Text:
    interference that can be injected through long cables. c©Copyright by Hyunkyu Ouh September 20, 2019 All

  • Effect of Imprinting Process on Fracture Behavior of a Zr-based Bulk Metallic Glass

    Creator:
    Li, Bosong
    Abstract:
    Bulk metallic glasses (BMGs) are relatively new amorphous materials that have received much attention in recent years. Rapid cooling methods from the liquid state provides the possibility to bypass crystallization during solidification. Due to the lack of crystal defects such as grain boundaries and dislocations, BMGs can have some special...
    Resource Type:
    Masters Thesis
    Full Text:
    treatment; (b) BMG sample finally obtained for tension testing; (c) detailed observation of the introduced

  • Ecology of Greenland halibut (Reinhardtius hippoglossoides) during the early life stages in the Eastern Bering Sea and Aleutian Islands

    Creator:
    Sohn, Dongwha
    Abstract:
    Greenland halibut (Reinhardtius hippoglossoides) have decreased in the eastern Bering Sea and Aleutian Islands since the 1970s. The reasons behind the poor recruitment are unknown, and important knowledge gaps of the ecology of the early life stages have been identified. The objectives of thesis research were (1) to examine geographic...
    Resource Type:
    Masters Thesis
    Full Text:
    sea temperatures ranging from -2.1 to 10 °C (Jensen 1935, Fedorov 1971, Templeman 1973 cited in

  • 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 and Skip. In addition, I would like to thank Prof. Megumi Kawasaki, Prof. William Warnes, and

  • The Partitioning Technique of Power System to Improve the Observability of Sub-System for Multi-area State Estimation

    Creator:
    Lyu, Tao
    Abstract:
    An accurate state estimation plays an essential role in power system operation and planning in energy management systems. However, existing multi-area state estimation researches have not focused on the importance of system clustering. The clustering mechanism divides or partitions a system according to user-defined criteria. Few published research works have...
    Resource Type:
    Dissertation
    Full Text:
    considerable improvement of accuracy and convergence can be achieved. c©Copyright by Tao Lyu March 20, 2020