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ASU Electronic Theses and Dissertations


This collection includes most of the ASU Theses and Dissertations from 2011 to present. ASU Theses and Dissertations are available in downloadable PDF format; however, a small percentage of items are under embargo. Information about the dissertations/theses includes degree information, committee members, an abstract, supporting data or media.

In addition to the electronic theses found in the ASU Digital Repository, ASU Theses and Dissertations can be found in the ASU Library Catalog.

Dissertations and Theses granted by Arizona State University are archived and made available through a joint effort of the ASU Graduate College and the ASU Libraries. For more information or questions about this collection contact or visit the Digital Repository ETD Library Guide or contact the ASU Graduate College at gradformat@asu.edu.


Date Range
2004 2020


In the upcoming decade, powerful new astronomical facilities such as the James Webb Space Telescope (JWST), the Square Kilometer Array (SKA), and ground-based 30-meter telescopes will open up the epoch of reionization to direct astronomical observation. One of the primary tools used to understand the bulk astrophysical properties of the high-redshift universe are empirically-derived star-forming laws, which relate observed luminosity to fundamental astrophysical quantities such as star formation rate. The radio/infrared relation is one of the more mysterious of these relations: despite its somewhat uncertain astrophysical origins, this relation is extremely tight and linear, with 0.3 dex of scatter over …

Contributors
Monkiewicz, Jacqueline, Bowman, Judd, Scowen, Paul, et al.
Created Date
2019

Transgenic experiments in Drosophila have proven to be a useful tool aiding in the determination of mammalian protein function. A CNS specific protein, dCORL is a member of the Sno/Ski family. Sno acts as a switch between Dpp/dActivin signaling. dCORL is involved in Dpp and dActivin signaling, but the two homologous mCORL protein functions are unknown. Conducting transgenic experiments in the adult wings, and third instar larval brains using mCORL1, mCORL2 and dCORL are used to provide insight into the function of these proteins. These experiments show mCORL1 has a different function from mCORL2 and dCORL when expressed in Drosophila. …

Contributors
Stinchfield, Michael J, Newfeld, Stuart J, Capco, David, et al.
Created Date
2019

Social skill impairments and executive dysfunctions caused by epilepsy adversely affect the social, psychological, and cognitive wellbeing of children and their families. Studies show that children with epilepsy are exposed to social, emotional, academic, personality, and behavioral problems when compared to healthy peers. This study focused on identifying the gaps between social skills and executive functioning among children with PCDH-19. The researcher relied on the responses from the sampled population to create reliable findings, discussions, conclusions, and recommendations for this project. The study used quantitative design and self-report approach whereby the participants completed survey that was comprised of various rating …

Contributors
Smith, Lourdes G, DiGangi, Samuel, Bryce, Crystal, et al.
Created Date
2019

Endowing machines with the ability to understand digital images is a critical task for a host of high-impact applications, including pathology detection in radiographic imaging, autonomous vehicles, and assistive technology for the visually impaired. Computer vision systems rely on large corpora of annotated data in order to train task-specific visual recognition models. Despite significant advances made over the past decade, the fact remains collecting and annotating the data needed to successfully train a model is a prohibitively expensive endeavor. Moreover, these models are prone to rapid performance degradation when applied to data sampled from a different domain. Recent works in …

Contributors
Dudley, Andrew, Panchanathan, Sethuraman, Venkateswara, Hemanth, et al.
Created Date
2019

The use of Reclaimed Asphalt Pavements (RAP) in newly produced asphalt mixtures has been gaining a wide attention from state Departments of Transportations (DOTs) during the past four decades. However, the performance of these mixtures in harsh and hot climate areas such as Phoenix, Arizona has not been carefully addressed. This research focuses on evaluating the laboratory and field performance of Hot Mix Asphalt Mixtures (HMA) produced with two different RAP contents 15%, and 25%. A road section was identified by the City of Phoenix where three test sections were constructed; the first being a control (0% RAP), the second …

Contributors
Zalghout, Ali Ahmad, Kaloush, Kamil, Fini, Elham, et al.
Created Date
2019

In this paper, the Software Defined Radio (SDR) platform is considered for building a pseudo-monostatic, 100MHz Pulse-Doppler radar. The SDR platform has many benefits for experimental communications systems as it offers relatively cheap, parametrically dynamic, off-the-shelf access to the Radiofrequency (RF) spectrum. For this application, the Universal Software Radio Peripheral (USRP) X310 hardware package is utilized with GNURadio for interfacing to the device and Matlab for signal post- processing. Pulse doppler radar processing is used to ascertain the range and velocity of a target considered in simulation and in real, over-the-air (OTA) experiments. The USRP platform offers a scalable and …

Contributors
Gubash, Gerard Robert, Bliss, Daniel W, Richmond, Christ, et al.
Created Date
2019

Until the second half of the 20th century, publications on breathing techniques for woodwinds have been scarce and often failed to adequately address this aspect of performance and pedagogy. It is through various sensory experiences and because of recent technological advances that academics recognize a gap in the existing literature and have since included studies using various methods, as well as modern technical devices and experiments into the woodwind literature and teaching. These studies have proven to be of great importance to confirm ideas and hypotheses on the matter. The aim of this project is to collect woodwind journal publications …

Contributors
Jevtic-Somlai, Csaba, Spring, Robert, Gardner, Joshua, et al.
Created Date
2019

Developing countries suffer from various health challenges due to inaccessible medical diagnostic laboratories and lack of resources to establish new laboratories. One way to address these issues is to develop diagnostic systems that are suitable for the low-resource setting. In addition to this, applications requiring rapid analyses further motivates the development of portable, easy-to-use, and accurate Point of Care (POC) diagnostics. Lateral Flow Immunoassays (LFIAs) are among the most successful POC tests as they satisfy most of the ASSURED criteria. However, factors like reagent stability, reaction rates limit the performance and robustness of LFIAs. The fluid flow rate in LFIA …

Contributors
Thamatam, Nipun, Christen, Jennifer Blain, Goryll, Michael, et al.
Created Date
2019

My Critical Yoga Studies investigation maps from the early 20th century to present day how yoga has become white through U.S. law and cultural productions, and has enhanced white privilege at the expense of Indian and people of color bodies. I position Critical Yoga Studies at the intersection of Yoga Studies, Critical Race Theory, Indigenous Studies, Mobilities Studies, and transnational American Studies. Scholars have linked uneven development and racial displacement (Soja, 1989; Harvey, 2006; Gilmore, 2007). How does racist displacement appear in historic and current contexts of development in yoga? In my dissertation, I use yoga mobilities to explain ongoing …

Contributors
Singh, Roopa, Lomawaima, K. Tsianina, Aggarwal, Rimjhim, et al.
Created Date
2019

Autonomous vehicle technology has been evolving for years since the Automated Highway System Project. However, this technology has been under increased scrutiny ever since an autonomous vehicle killed Elaine Herzberg, who was crossing the street in Tempe, Arizona in March 2018. Recent tests of autonomous vehicles on public roads have faced opposition from nearby residents. Before these vehicles are widely deployed, it is imperative that the general public trusts them. For this, the vehicles must be able to identify objects in their surroundings and demonstrate the ability to follow traffic rules while making decisions with human-like moral integrity when confronted …

Contributors
Sankaramangalam Ulhas, Sangeet, Berman, Spring, Johnson, Kathryn, et al.
Created Date
2019

The 78 secondary eclipse depths for a sample of 36 transiting hot Jupiters observed at 3.6- and 4.5 μm using the Spitzer Space Telescope is here reported. Eclipse results for 27 of these planets are new and include highly irradiated worlds such as KELT-7b (Kilodegree Extremely Little Telescope), WASP-87b (Wide Angle Search for Planets), WASP-76b, and WASP-64b, and important targets for the James Webb Space Telescope (JWST) such as WASP-62b. WASP-62b is found to have a slightly eccentric orbit (ecosω=0.00614±0.00058), and the eccentricities of HAT-P-13b (Hungarian Automated Telescope Project) and WASP-14b are confirmed. The remainder are individually consistent with circular …

Contributors
Garhart, Emily, Christensen, Phil, Line, Michael, et al.
Created Date
2019

Participatory approaches to policy-making and research are thought to “open up” technical decision-making to broader considerations, empower diverse public audiences, and inform policies that address pluralistic public goods. Many studies of participatory efforts focus on specific features or outcomes of those efforts, such as the format of a participatory event or the opinions of participants. While valuable, such research has not resolved conceptual problems and critiques of participatory efforts regarding, for example, their reinforcement of expert perspectives or their inability to impact policy- and decision-making. I studied two participatory efforts using survey data collected from participants, interviews with policy makers …

Contributors
Weller, Nicholas A, Childers, Daniel L, Bennett, Ira, et al.
Created Date
2019

Recent studies have shown that human papillomavirus (HPV) plays a role in development of cancers, one of which is head and neck cancer. There is strong and consistent molecular evidence demonstrating that human papillomavirus (HPV) is an etiological cause of these oropharyngeal cancers. Despite the introduction of HPV vaccines, there is still an increase in human papillomavirus associated OPC (HPVOPC) and it is expected that the incidence of head and neck cancer, specifically oropharyngeal cancer (OPC) will increase. The aim of this study is to utilize human papillomavirus (HPV) seropositivity for rapid detection of HPV early specific antigen-antibodies using a …

Contributors
Ladipo, Evelyn, Anderson, Karen S, Hogue, Brenda G, et al.
Created Date
2019

The problem of multiple object tracking seeks to jointly estimate the time-varying cardinality and trajectory of each object. There are numerous challenges that are encountered in tracking multiple objects including a time-varying number of measurements, under varying constraints, and environmental conditions. In this thesis, the proposed statistical methods integrate the use of physical-based models with Bayesian nonparametric methods to address the main challenges in a tracking problem. In particular, Bayesian nonparametric methods are exploited to efficiently and robustly infer object identity and learn time-dependent cardinality; together with Bayesian inference methods, they are also used to associate measurements to objects and …

Contributors
Moraffah, Bahman, Papandreou-Suppappola, Antonia, Bliss, Daniel W., et al.
Created Date
2019

With the InSight mission deploying a seismometer , Martian bulk chemical compositional models are more important than ever. Three largely consistent models for the Martian mantle have been suggested over the past two decades. Of these three, two are fairly similar and one is dramatically different. Of these three, the EH70 (Sanloup et al., 1999) models have the systematically lower divalent cation to silicon ratios as compared to the other model, the DW85 (Dreibus and Wanke, 1985) model. However, impact of such a low (Mg+Fe+Ca)/Si ratio on mineralogy has not been experimentally investigated. Measurements have been made of the mineralogy …

Contributors
Dolinschi, Jonathan David, Shim, Sang-Heon D., Desch, Steven, et al.
Created Date
2019

Imagine you live in a place without any storm water or wastewater systems! Wastewater and storm water systems are two of the most crucial systems for urban infrastructure. Water resources have become more limited and expensive in arid and semi-arid regions. According to the fourth World Water Development Report, over 80% of global wastewater is released into the environment without adequate treatment. Wastewater collection and treatment systems in the Kingdom of Saudi Arabia (KSA) covers about 49% of urban areas; about 25% of treated wastewater is used for landscape and crop irrigation (Ministry of Environment Water and Agriculture [MEWA], 2017). …

Contributors
Alfaisal, Faisal Mohammed, Mays, Larry W., Mascaro, Giuseppe, et al.
Created Date
2019

Graphs are commonly used visualization tools in a variety of fields. Algorithms have been proposed that claim to improve the readability of graphs by reducing edge crossings, adjusting edge length, or some other means. However, little research has been done to determine which of these algorithms best suit human perception for particular graph properties. This thesis explores four different graph properties: average local clustering coefficient (ALCC), global clustering coefficient (GCC), number of triangles (NT), and diameter. For each of these properties, three different graph layouts are applied to represent three different approaches to graph visualization: multidimensional scaling (MDS), force directed …

Contributors
Clayton, Benjamin, Maciejewski, Ross, Kobourov, Stephen, et al.
Created Date
2019

Artificial general intelligence consists of many components, one of which is Natural Language Understanding (NLU). One of the applications of NLU is Reading Comprehension where it is expected that a system understand all aspects of a text. Further, understanding natural procedure-describing text that deals with existence of entities and effects of actions on these entities while doing reasoning and inference at the same time is a particularly difficult task. A recent natural language dataset by the Allen Institute of Artificial Intelligence, ProPara, attempted to address the challenges to determine entity existence and entity tracking in natural text. As part of …

Contributors
Bhattacharjee, Aurgho, Baral, Chitta, Yang, Yezhou, et al.
Created Date
2019

Part I – I analyze a database of Smoothed Particle Hydrodynamics (SPH) simulations of collisions between planetary bodies and use the data to define semi-empirical models that reproduce remant masses. These models may be leveraged when detailed, time-dependent aspects of the collision are not paramount, but analytical intuition or a rapid solution is required, e.g. in ‘N-body simulations’. I find that the stratification of the planet is a non-negligible control on accretion efficiency. I also show that the absolute scale (total mass) of the collision may affect the accretion efficiency, with larger bodies more efficiently disrupting, as a function of …

Contributors
Gabriel, Travis Saint James, Asphaug, Erik I, Hardgrove, Craig, et al.
Created Date
2019

Corrosion fatigue has been of prime concern in railways, aerospace, construction industries and so on. Even in the case of many medical equipment, corrosion fatigue is considered to be a major challenge. The fact that even high strength materials have lower resistance to corrosion fatigue makes it an interesting area for research. The analysis of propagation of fatigue crack growth under environmental interaction and the life prediction is significant to reduce the maintenance costs and assure structural integrity. Without proper investigation of the crack extension under corrosion fatigue, the scenario can lead to catastrophic disasters due to premature failure of …

Contributors
Kurian, Bianca, Liu, Yongming, Nian, Qiong, et al.
Created Date
2019

Question answering is a challenging problem and a long term goal of Artificial Intelligence. There are many approaches proposed to solve this problem, including end to end machine learning systems, Information Retrieval based approaches and Textual Entailment. Despite being popular, these methods find difficulty in solving problems that require multi level reasoning and combining independent pieces of knowledge, for example, a question like "What adaptation is necessary in intertidal ecosystems but not in reef ecosystems?'', requires the system to consider qualities, behaviour or features of an organism living in an intertidal ecosystem and compare with that of an organism in …

Contributors
Batni, Vaishnavi, Baral, Chitta, Anwar, Saadat, et al.
Created Date
2019

The study was to analyze the extent of bacterial transport in a two-dimensional tank under saturated conditions. The experiments were done in a 2-D tank packed with 3,700 in3 of fine grained, homogenous, chemically inert sand under saturated conditions. The tank used for transport was decontaminated by backwashing with 0.6% chlorine solution with subsequent backwashing with chlorine-neutral water (tap water and Na2S2O3) thus ensuring no residual chlorine in the tank. The transport of bacteria was measured using samples collected from ports at vertical distances of 5, 15 and 25 inches (12.7, 38.1 and 63.5 cm) from the surface of the …

Contributors
Mondal, Indrayudh, Abbaszadegan, Morteza, Dahlen, Paul, et al.
Created Date
2019

Droplet-structure interactions play a pivotal role in many engineering applications as droplet-based solutions are evolving. This work explores the physical understanding of these interactions through systematic research leading to improvements in thermal management via dropwise condensation (DWC), and breathable protective wearables against chemical aerosols for better thermoregulation. In DWC, the heat transfer rate can be further increased by increasing the nucleation and by optimally ‘refreshing’ the surface via droplet shedding. Softening of surfaces favor the former while having an adverse effect on the latter. This optimization problem is addressed by investigating how mechanical properties of a substrate impact relevant droplet-surface …

Contributors
Phadnis, Akshay, Rykaczewski, Konrad, Wang, Robert, et al.
Created Date
2019

Water is one of, if not the most valuable natural resource but extremely challenging to manage. According to old research in the field, many Water Distribution Systems (WDSs) around the world lose above 40 percent of clean water pumped into the distribution system because of unfortune leaks before the water gets anywhere from the fresh water resources. By reducing the amount of water leaked, distribution system managers can reduce the amount of money, resources, and energy wasted on finding and repairing the leaks, and then producing and pumping water, increase system reliability and more easily satisfy present and future needs …

Contributors
srivastava, siddhant, Lee, TaeWoo, Kwan, Beomjin, et al.
Created Date
2019

Although most Americans support capital punishment, many people have misconceptions about its efficacy and administration (e.g., that capital punishment deters crime). Can correcting people’s inaccurate attitudes change their support for the death penalty? If not, are there other strategies that might shift people’s attitudes about the death penalty? Some research suggests that statistical information can correct misconceptions about polarizing topics. Yet, statistics might be irrelevant if people support capital punishment for purely retributive reasons, suggesting other argumentative strategies may be more effective. In Study 1, I compared how two different interventions shifted attitudes towards the death penalty. In Studies 2 …

Contributors
Miske, Olivia Anne, Schweitzer, Nicholas J, Horne, Zachary S, et al.
Created Date
2019

This dissertation combines three research projects to examine the people affecting and affected by urban environmental change across multiple scales of decision making. In the Phoenix Metropolitan area and the Colorado River Basin, I study the social influence around the implementation of water use innovations among city-level stakeholders (Chapter 2) and I emphasize that water insecurity still exists in wealthy cities (Chapter 3). In Chapter 4, I ultimately consider grassroots solutions for achieving resource security alongside positive social change in a historically underserved community. In this dissertation, I have conceptualized my research questions by envisioning urban change as an opportunity …

Contributors
DeMyers, Christine, Wutich, Amber, White, Dave, et al.
Created Date
2019

Several key, open questions in astrophysics can be tackled by searching for and mining large datasets for transient phenomena. The evolution of massive stars and compact objects can be studied over cosmic time by identifying supernovae (SNe) and gamma-ray bursts (GRBs) in other galaxies and determining their redshifts. Modeling GRBs and their afterglows to probe the jets of GRBs can shed light on the emission mechanism, rate, and energetics of these events. In Chapter 1, I discuss the current state of astronomical transient study, including sources of interest, instrumentation, and data reduction techniques, with a focus on work in the …

Contributors
Strausbaugh, Robert, Butler, Nathaniel, Jansen, Rolf, et al.
Created Date
2019

One strategic objective of the National Aeronautics and Space Administration (NASA) is to find life on distant worlds. Current and future missions either space telescopes or Earth-based observatories are frequently used to collect information through the detection of photons from exoplanet atmospheres. The primary challenge is to fully understand the nature of these exo-atmospheres. To this end, atmospheric modeling and sophisticated data analysis techniques are playing a key role in understanding the emission and transmission spectra of exoplanet atmospheres. Of critical importance to the interpretation of such data are the opacities (or absorption cross-sections) of key molecules and atoms. During …

Contributors
Gharib-Nezhad, Ehsan, Line, Michael R., Lyons, James R., et al.
Created Date
2019

A Fundamental study of bulk, layered, and monolayers bromide lead perovskites structural, optical, and electrical properties have been studied as thickness changes. X-Ray Diffraction (XRD) and Raman spectroscopy measures the structural parameter showing how the difference in the thicknesses changes the crystal structures through observing changes in average lattice constant, atomic spacing, and lattice vibrations. Optical and electrical properties have also been studied mainly focusing on the thickness effect on different properties where the Photoluminescence (PL) and exciton binding energies show energy shift as thickness of the material changes. Temperature dependent PL has shown different characteristics when comparing methylammonium lead …

Contributors
Alenezi, Omar, Tongay, Sefaattin, King, Richard, et al.
Created Date
2019

This thesis intends to cover the experimental investigation of the propagation of laser-generated optoacoustic waves in structural materials and how they can be utilized for damage detection. Firstly, a system for scanning a rectangular patch on the sample is designed. This is achieved with the help of xy stages which are connected to the laser head and allow it to move on a plane. Next, a parametric study was designed to determine the optimum testing parameters of the laser. The parameters so selected were then used in a series of tests which helped in discerning how the Ultrasound Waves behave …

Contributors
Ravi Narayanan, Venkateshwaran, Liu, Yongming, Zhuang, Houlong, et al.
Created Date
2019

I propose a new approach for the analysis of social transformations within the context of colonialism. Drawing on concepts used by historical sociologists, combined with insights from historians and archaeologists, I forge a synthesis of relational mechanisms that concatenated into processes of categorical change. Within the social sciences, mechanisms are formally defined as specific classes of events or social interactions that are causally linked and tend to repeat under specific conditions, potentially resulting in widespread social transformations. Examples of mechanisms include formal inscription through spatial segregation and adjustments in individual position through socioeconomic mobility. For New Spain, historians have identified …

Contributors
Eschbach, Krista, Stark, Barbara L, Smith, Michael E, et al.
Created Date
2019

As the microelectronics industry continues to decrease the size of solder joints, each joint will have to carry a greater current density, making atom diffusion due to current flow, electromigration (EM), a problem of ever-increasing severity. The rate of EM damage depends on current density, operating temperature, and the original microstructure of the solder joint, including void volume, grain orientation, and grain size. While numerous studies have investigated the post-mortem effects of EM and have tested a range of current densities and temperatures, none have been able to analyze how the same joint evolves from its initial to final microstructure. …

Contributors
Branch Kelly, Marion, Chawla, Nikhilesh, Ankit, Kumar, et al.
Created Date
2019

Extracellular Vesicles (EVs), particularly exosomes, are of considerable interest as tumor biomarkers since tumor-derived EVs contain a broad array of information about tumor pathophysiology including its metabolic and metastatic status. However, current EV based assays cannot distinguish between EV biomarker changes by altered secretion of EVs during diseased conditions like cancer, inflammation, etc. that express a constant level of a given biomarker, stable secretion of EVs with altered biomarker expression, or a combination of these two factors. This issue was addressed by developing a nanoparticle and dye-based fluorescent immunoassay that can distinguish among these possibilities by normalizing EV biomarker level(s) …

Contributors
Rodrigues, Meryl, Hu, Tony, Nikkhah, Mehdi, et al.
Created Date
2019

Workplaces are the place where people spend mostly half of their life there. It is not exclusive to office buildings and companies; indeed, in each department in every building there are individuals working behind the scenes in an attempt to better the society. The workplace environment must accomplish workers’ requirements that vary between physical, emotional, psychological, and spiritual needs. Thus, the employees can provide high performance and be more productive, which leads to a successful group, corporations, society, and world generally. The aims for this study were to explore the different strategies that big companies used to attract new employees …

Contributors
Alaithan, Hana, Bernardi, Jose, Brunner, Lori, et al.
Created Date
2019

This dissertation details the development of an open source, frequency domain multiplexed (FDM) readout for large-format arrays of superconducting lumped-element kinetic inductance detectors (LEKIDs). The system architecture is designed to meet the requirements of current and next generation balloon-borne and ground-based submillimeter (sub-mm), far-infrared (FIR) and millimeter-wave (mm-wave) astronomical cameras, whose science goals will soon drive the pixel counts of sub-mm detector arrays from the kilopixel to the megapixel regime. The in-flight performance of the readout system was verified during the summer, 2018 flight of ASI's OLIMPO balloon-borne telescope, from Svalbard, Norway. This was the first flight for both LEKID …

Contributors
Gordon, Samuel, Mauskopf, Philip, Groppi, Christopher, et al.
Created Date
2019

In many social-ecological systems, shared resources play a critical role in supporting the livelihoods of rural populations. Physical infrastructure enables resource access and reduces the variability of resource supply. In order for the infrastructure to remain functional, institutions must incentivize individuals to engage in provision and maintenance. The objective of my dissertation is to understand key formal and informal institutions that affect provision of shared infrastructure and the policy tools that may improve infrastructure provision. I examine these questions in the context of irrigation systems in India because infrastructure maintenance is a persistent challenge and system function is critical for …

Contributors
Vallury, Sechindra, Abbott, Joshua K, Anderies, John M, et al.
Created Date
2019

The presence of police officers is not an assurance of safety for everyone. Yet, modern concerns for school safety suggest there is a need for more police officers in schools. Over the last 70 years of School Resource Officer (SRO) programs, the variations of SRO program implementation and the expectation of roles and responsibilities has produced conflicting research on benefits or harms of police in the school environment. The purpose of police in schools has shuffled from relationship-building ambassadors for the community, to educators on crime prevention and drug use, to law enforcement officers for punitive juvenile sanctions, to counselors …

Contributors
Herbert, Jessica L., Sweeten, Gary, Decker, Scott, et al.
Created Date
2019

Micro/meso combustion has several advantages over regular combustion in terms of scale, efficiency, enhanced heat and mass transfer, quick startup and shutdown, fuel utilization and carbon footprint. This study aims to analyze the effect of temperature on critical sooting equivalence ratio and precursor formation in a micro-flow reactor. The effect of temperature on the critical sooting equivalence ratio of propane/air mixture at atmospheric pressure with temperatures ranging from 750-1250°C was investigated using a micro-flow reactor with a controlled temperature profile of diameter 2.3mm, equivalence ratios of 1-13 and inlet flow rates of 10 and 100sccm. The effect of inert gas …

Contributors
Khalid, Abdul Hannan Hannan, Milcarek, Ryan, Dahm, Werner, et al.
Created Date
2019

Layered chalcogenides are a diverse class of crystalline materials that consist of covalently bound building blocks held together by van der Waals forces, including the transition metal dichalcogenides (TMDCs) and the pnictogen chalcogenides (PCs) among all. These materials, in particular, MoS2 which is the most widely studied TMDC material, have attracted significant attention in recent years due to their unique physical, electronic, optical, and chemical properties that depend on the number of layers. Due to their high aspect ratios and extreme thinness, 2D materials are sensitive to modifications via chemistry on their surfaces. For instance, covalent functionalization can be used …

Contributors
Li, Duo, Wang, Qing Hua, Green, Alexander A., et al.
Created Date
2019

With the advancements in technology, it is now possible to synthesize new materials with specific microstructures, and enhanced mechanical and physical properties. One of the new class of materials are nanoscale metallic multilayers, often referred to as nanolaminates. Nanolaminates are composed of alternating, nanometer-thick layers of multiple materials (typically metals or ceramics), and exhibit very high strength, wear resistance and radiation tolerance. This thesis is focused on the fabrication and mechanical characterization of nanolaminates composed of Copper and Cobalt, two metals which are nearly immiscible across the entire composition range. The synthesis of these Cu-Co nanolaminates is performed using sputtering, …

Contributors
Rajarajan, Santhosh Kiran, Rajagopalan, Jagannathan, Oswald, Jay, et al.
Created Date
2019

This dissertation advances the capability of water infrastructure utilities to anticipate and adapt to vulnerabilities in their systems from temperature increase and interdependencies with other infrastructure systems. Impact assessment models of increased heat and interdependencies were developed which incorporate probability, spatial, temporal, and operational information. Key findings from the models are that with increased heat the increased likelihood of water quality non-compliances is particularly concerning, the anticipated increases in different hardware components generate different levels of concern starting with iron pipes, then pumps, and then PVC pipes, the effects of temperature increase on hardware components and on service losses are …

Contributors
Bondank, Emily Nicole, Chester, Mikhail V, Ruddell, Benjamin L, et al.
Created Date
2019

In this thesis, I investigate possible formation processes in the northern Claritas Fossae and the large Thaumasia graben on Mars. In particular, I assess three proposed formation hypotheses for the region: a mega-landslide across the Thaumasia plateau, originating in Tharsis and moving to the south-west; a rift system pulling apart Claritas Fossae and opening the large Thaumasia graben generally propagating in a north-south direction: and extension caused by uplifting from underlying dike swarms. Using digital terrain models (DTMs) from the High Resolution Stereo Camera (HRSC) aboard Mars Express and visual images from the Context Camera (CTX) aboard the Mars Reconnaissance …

Contributors
Studer-Ellis, Genevieve Lynn, Williams, David A., Christensen, Philip R., et al.
Created Date
2019

Functional brain imaging experiments are widely conducted in many fields for study- ing the underlying brain activity in response to mental stimuli. For such experiments, it is crucial to select a good sequence of mental stimuli that allow researchers to collect informative data for making precise and valid statistical inferences at minimum cost. In contrast to most existing studies, the aim of this study is to obtain optimal designs for brain mapping technology with an ultra-high temporal resolution with respect to some common statistical optimality criteria. The first topic of this work is on finding optimal designs when the primary …

Contributors
Alghamdi, Reem, Kao, Ming-Hung, Fricks, John, et al.
Created Date
2019

With the fast pace of globalization and the rise of encounters in digital spaces, CALL scholars have become increasingly interested in how digital tools mediate intercultural encounters. However, despite their evident success in connecting students from around the world, current online intercultural exchanges continue to present problems such a promotion of positive experiences over deep intercultural learning and lack of real-life value (O’ Dowd, 2018). In addition, digitally-mediated intercultural learning research is based on the same theoretical approaches to learning that guide CALL research (Firth & Wagner, 1997; Lafford, 2017). Although such frameworks are successful in allowing researchers to conceive …

Contributors
Ocando Finol, Maria Virginia, Lafford, Barbara, Cuya Gavilano, Lorena, et al.
Created Date
2019

This dissertation focuses on three different efficiency enhancement methods that are applicable to handset applications. These proposed designs are based on three critical requirements for handset application: 1) Small form factor, 2) CMOS compatibility and 3) high power handling. The three presented methodologies are listed below: 1) A transformer-based power combiner architecture for out-phasing transmitters 2) A current steering DAC-based average power tracking circuit for on-chip power amplifiers (PA) 3) A CMOS-based driver stage for GaN-based switched-mode power amplifiers applicable to fully digital transmitters This thesis highlights the trends in wireless handsets, the motivates the need for fully-integrated CMOS power …

Contributors
Moallemi, Soroush, Kitchen, Jennifer, Kiaei, Sayfe, et al.
Created Date
2019

Membrane based technology is one of the principal methods currently in widespread use to address the global water shortage. Pervaporation desalination is a membrane technology for water purification currently under investigation as a method for processing reverse osmosis concentrates or for stand-alone applications. Concentration polarization is a potential problem in any membrane separation. In desalination concentration polarization can lead to reduced water flux, increased propensity for membrane scaling, and decreased quality of the product water. Quantifying concentration polarization is important because reducing concentration polarization requires increased capital and operating costs in the form of feed spacers and high feed flow …

Contributors
Mann, Stewart Conrad, Lind, Mary Laura, Walker, Shane, et al.
Created Date
2019

Aromatic compounds have traditionally been generated via petroleum feedstocks and have wide ranging applications in a variety of fields such as cosmetics, food, plastics, and pharmaceuticals. Substantial improvements have been made to sustainably produce many aromatic chemicals from renewable sources utilizing microbes as bio-factories. By assembling and optimizing native and non-native pathways to produce natural and non-natural bioproducts, the diversity of biochemical aromatics which can be produced is constantly being improved upon. One such compound, 2-Phenylethanol (2PE), is a key molecule used in the fragrance and food industries, as well as a potential biofuel. Here, a novel, non-natural pathway was …

Contributors
Machas, Michael Stafford, Nielsen, David R, Haynes, Karmella, et al.
Created Date
2019

This research investigates teachers' understanding of and feelings about transdisciplinary education and the International Baccalaureate's Primary Years Programme (PYP) as utilized by two remote schools in the province of Papua, Indonesia on the island of New Guinea. A goal of transdisciplinary education is to make learning through inquiry authentic, broad, student-centered, and relevant to the real world. In this study I examine educators’ perspectives of how transdisciplinary education is manifested in the two different and yet related elementary schools. Both schools are supported by a multinational mining company. One school is for expatriate students and the language of instruction is …

Contributors
Erikson, Anita Elice, Stauffer, Sandra L, Sullivan, Jill M, et al.
Created Date
2019

Solar energy has become one of the most popular renewable energy in human’s life because of its abundance and environment friendliness. To achieve high solar energy conversion efficiency, it usually requires surfaces to absorb selectivity within one spectral range of interest and reflect strongly over the rest of the spectrum. An economic method is always desired to fabricate spectrally selective surfaces with improved energy conversion efficiency. Colloidal lithography is a recently emerged way of nanofabrication, which has advantages of low-cost and easy operation. In this thesis, aluminum metasurface structures are proposed based on colloidal lithography method. High Frequency Structure Simulator …

Contributors
Guan, Chuyun, Wang, Liping, Azeredo, Bruno, et al.
Created Date
2019

This project was completed to understand the evolution of the ability to digest wood in termite symbiotic protists. Lower termites harbor bacterial and protist symbionts which are essential to the termite ability to use wood as a nutritional source, producing glycoside hydrolases to break down the polysaccharides found in lignocellulose. Yet, only a few molecular studies have been done to confirm the protist species responsible for particular enzymes. By mining publicly available and newly generated genomic and transcriptomic data, including three transcriptomes from isolated protist cells, I identify over 200 new glycoside hydrolase sequences and compute the phylogenies of eight …

Contributors
Sanderlin, Viola, Gile, Gillian H, Wojciechowski, Martin, et al.
Created Date
2019