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.
Displaying 11,551 - 11,560 of 14,444
Description
Research shows that the subject of mathematics, although revered, remains a source of trepidation for many individuals, as they find it difficult to form a connection between the work they do on paper and their work's practical applications. This research study describes the impact of teaching a challenging introductive applied mathematics course on high school students' skills and attitudes towards mathematics in a college Summer Program. In the analysis of my research data, I identified several emerging changes in skills and attitudes towards mathematics, skills that high-school students needed or developed when taking the mathematical modeling course. Results indicated that the applied mathematics course had a positive impact on several students' attitudes, in general, such as, self-confidence, meanings of what mathematics is, and their perceptions of what solutions are. It also had a positive impact on several skills, such as translating real-life situations to mathematics via flow diagrams, translating the models' solutions back from mathematics to the real world, and interpreting graphs. Students showed positive results when the context of their problems was applied or graphical, and fewer improvement on problems that were not. Research also indicated some negatives outcomes, a decrease in confidence for certain students, and persistent negative ways of thinking about graphs. Based on these findings, I make recommendations for teaching similar mathematical modeling at the pre-university level, to encourage the development of young students through educational, research and similar mentorship activities, to increase their inspiration and interest in mathematics, and possibly consider a variety of sciences, technology, engineering and mathematics-related (STEM) fields and careers.
Contributorsagoune, linda (Author) / Castillo-Chavez, Carlos (Thesis advisor) / Castillo-Garsow, Carlos W (Thesis advisor) / Mubayi, Anuj (Committee member) / Arizona State University (Publisher)
Created2020
Description
Suction stabilized floats have been implemented into a variety of applications such as supporting wind turbines in off-shore wind farms and for stabilizing cargo ships. This thesis proposes an alternative use for the technology in creating a system of suction stabilized floats equipped with real time location modules to help first responders establish a localized coordinate system to assist in rescues. The floats create a stabilized platform for each anchor module due to the inverse slack tank effect established by the inner water chamber. The design of the float has also been proven to be stable in most cases of amplitudes and frequencies ranging from 0 to 100 except for when the frequency ranges from 23 to 60 Hz for almost all values of the amplitude. The modules in the system form a coordinate grid based off the anchors that can track the location of a tag module within the range of the system using ultra-wideband communications. This method of location identification allows responders to use the system in GPS denied environments. The system can be accessed through an Android app with Bluetooth communications in close ranges or through internet of things (IoT) using a module as a listener, a Raspberry Pi and an internet source. The system has proven to identify the location of the tag in moderate ranges with an approximate accuracy of the tag location being 15 cm.
ContributorsDye, Michaela (Author) / Redkar, Sangram (Thesis advisor) / Sugar, Thomas (Committee member) / Rogers, Bradley (Committee member) / Arizona State University (Publisher)
Created2020
Description
Compressible fluid flows involving multiple physical states of matter occur in both nature and technical applications such as underwater explosions and implosions, cavitation-induced bubble collapse in naval applications and Richtmyer-Meshkov type instabilities in inertial confinement fusion. Of particular interest is the atomization of fuels that enable shock-induced mixing of fuel and oxidizer in supersonic combustors. Due to low residence times and varying length scales, providing insight through physical experiments is both technically challenging and sometimes unfeasible. Numerical simulations can help provide detailed insight and aid in the engineering design of devices that can harness these physical phenomena.
In this research, computational methods were developed to accurately simulate phase interfaces in compressible fluid flows with a focus on targeting primary atomization. Novel numerical methods which treat the phase interface as a discontinuity, and as a smeared region were developed using low-dissipation, high-order schemes. The resulting methods account for the effects of compressibility, surface tension and viscosity. To aid with the varying length scales and high-resolution requirements found in atomization applications, an adaptive mesh refinement (AMR) framework is used to provide high-resolution only in regions of interest. The developed methods were verified with test cases involving strong shocks, high density ratios, surface tension effects and jumps in the equations of state, in one-, two- and three dimensions, obtaining good agreement with theoretical and experimental results. An application case of the primary atomization of a liquid jet injected into a Mach 2 supersonic crossflow of air is performed with the methods developed.
In this research, computational methods were developed to accurately simulate phase interfaces in compressible fluid flows with a focus on targeting primary atomization. Novel numerical methods which treat the phase interface as a discontinuity, and as a smeared region were developed using low-dissipation, high-order schemes. The resulting methods account for the effects of compressibility, surface tension and viscosity. To aid with the varying length scales and high-resolution requirements found in atomization applications, an adaptive mesh refinement (AMR) framework is used to provide high-resolution only in regions of interest. The developed methods were verified with test cases involving strong shocks, high density ratios, surface tension effects and jumps in the equations of state, in one-, two- and three dimensions, obtaining good agreement with theoretical and experimental results. An application case of the primary atomization of a liquid jet injected into a Mach 2 supersonic crossflow of air is performed with the methods developed.
ContributorsKannan, Karthik (Author) / Herrmann, Marcus (Thesis advisor) / Huang, Huei-Ping (Committee member) / Lopez, Juan (Committee member) / Peet, Yulia (Committee member) / Wang, Liping (Committee member) / Arizona State University (Publisher)
Created2020
Description
Employee-owned businesses, benefit corporations, social enterprises, and other sustainability entrepreneurship innovations are responding to challenges such as climate change, economic inequalities, and unethical business behavior. Academic programs to date, however, often fall short in sufficiently equipping students with competencies in sustainability entrepreneurship – from a coherent set of learning objectives, through effective and engaging pedagogies, to rigorous assessment of learning outcomes. This dissertation contributes to bridging these gaps. The first study proposes a process-oriented and literature-based framework of sustainability entrepreneurship competencies. It offers a general vision for students, faculty, and entrepreneurs, as well as for the design of curricula, courses, and assessments. The second study presents an exploration into the nature of sustainability entrepreneurship courses, with a focus on teaching and learning processes. Using pioneering courses at Arizona State University, the study analyzes and compares the links between learning objectives, pedagogies, and learning outcomes. Based on document analysis and semi-structured interviews with course instructors, the study identifies cognitive apprenticeship from input processing to experimentation, constructive alignment from learning objectives to assessments, and curriculum-level coordination across courses as key success factors of sustainability entrepreneurship education. The result of this study can inform instructors and researchers in applying and further substantiating effective educational models for future entrepreneurs. The third study addresses the key question of competence assessment: what are reliable tools for assessing students’ competence in sustainability entrepreneurship? This study developed and tested a novel tool for assessing students’ competence in sustainability entrepreneurship through in-vivo simulated professional situations. The tool was in different settings and evaluated against a set of criteria derived from the literature. To inform educators in business and management programs, this study discusses and concludes under which conditions this assessment tool seems most effective, as well as improvement for future applications of the tool.
ContributorsFoucrier, Tamsin (Author) / Wiek, Arnim (Thesis advisor) / Basile, George (Thesis advisor) / Barth, Matthias (Committee member) / Arizona State University (Publisher)
Created2020
Description
“In Spirit - An Archetypal Journey of the Soul” is a document illustrating the process of creating an evening length autobiographical aerial dance theater performance, In Spirit, through the investigation of theoretical, kinesthetic and choreographic research of archetypal symbolism, as well as aesthetic, choreographic and pedagogical aspects of aerial dance. The Jungian research specifically informed the identification of symbolism and the roles that archetypes play in creating a clear storyline within aerial dance theatre. In addition, research of aesthetic voice and current aerial dance practitioners became important and gave perspectives on creative pedagogical engagement in contemporary dance and aerial dance-making. For the duration of the process of creating In Spirit image-based creative tools, tarot symbolism, Jungian archetypes, aerial dance training and collaboration were explored with the cast of ten dancers. Through this research and embodying the spirit of collaboration, the choreographer and dancers worked diligently to train dancers with no previous experience in aerial dance to perform in aerial roles. The evening-length performance of In Spirit synthesized contemporary dance, aerial dance, theatre and symbolism regarding rebirth.
ContributorsReed, Elisa M (Author) / Fitzgerald, Mary (Thesis advisor) / Schupp, Karen (Committee member) / Winnemann, Christopher (Committee member) / Arizona State University (Publisher)
Created2020
Description
“Mix Mix Tayo: The Many Pieces in Our Stories'' is a written reflection, exploring the creation of the dance documentary, Carried Across the Water as well as the community event, Mix Mix Tayo. The ideas behind these works are centered in storytelling, filipino american identity and community. This research explores the use of film, dance, event production and the mixing of elements to create new wholes in order to communicate these ideas. These works were imagined in response to a call that was felt from people actively searching for healing, community and ancestral knowledge.
ContributorsCurry, Nicole (Author) / Standley, Eileen (Thesis advisor) / Fitzgerald, Mary (Committee member) / Nascimento, Eliciana (Committee member) / Arizona State University (Publisher)
Created2020
Description
Per- and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that are detected ubiquitously in the aquatic environment, biota, and humans. Human exposure and adverse health of PFAS through consuming impacted drinking water is getting regulatory attention. Adsorption using granular activated carbon (GAC) and ion exchange resin (IX) has proved to be efficient in removing PFAS from water. There is a need to study the effectiveness of commercially available sorbents in PFAS removal at the pilot-scale with real PFAS contaminated water, which would aid in efficient full-scale plant design. Additionally, there is also a need to have validated bench-scale testing techniques to aid municipalities and researchers in selecting or comparing adsorbents to remove PFAS. Rapid Small-Scale Column Tests (RSSCTs) are bench-scale testing to assess media performance and operational life to remove trace organics but have not been validated for PFAS. Different design considerations exist for RSSCTs, which rely upon either proportional diffusivity (PD) or constant diffusivity (CD) dimensionless scaling relationships.
This thesis aims to validate the use of RSSCTs to simulate PFAS breakthrough in pilot columns. First, a pilot-scale study using two GACs and an IX was conducted for five months at a wellsite in central Arizona. PFAS adsorption capacity was greatest for a commercial IX, and then two GAC sources exhibited similar performance. Second, RSSCTs scaled using PD or CD relationships, simulated the pilot columns, were designed and performed. For IX and the two types of GAC, the CD–RSSCTs simulated the PFAS breakthrough concentration, shape, and order of C8 to C4 compounds observed pilot columns better than the PD-RSSCTs. Finally, PFAS breakthrough and adsorption capacities for PD- and CD-RSSCTs were performed on multiple groundwaters (GWs) from across Arizona to assess the treatability of PFAS chain length and functional head-group moieties. PFAS breakthrough in GAC and IX was dictated by chain length (C4>C6>C8) and functional group (PFCAs>PFSAs) of the compound. Shorter-chain PFAS broke through earlier than the longer chain, and removal trends were related to the hydrophobicity of PFAS. Overall, single-use IX performed superior to any of the evaluated GACs across a range of water chemistries in Arizona GWs.
This thesis aims to validate the use of RSSCTs to simulate PFAS breakthrough in pilot columns. First, a pilot-scale study using two GACs and an IX was conducted for five months at a wellsite in central Arizona. PFAS adsorption capacity was greatest for a commercial IX, and then two GAC sources exhibited similar performance. Second, RSSCTs scaled using PD or CD relationships, simulated the pilot columns, were designed and performed. For IX and the two types of GAC, the CD–RSSCTs simulated the PFAS breakthrough concentration, shape, and order of C8 to C4 compounds observed pilot columns better than the PD-RSSCTs. Finally, PFAS breakthrough and adsorption capacities for PD- and CD-RSSCTs were performed on multiple groundwaters (GWs) from across Arizona to assess the treatability of PFAS chain length and functional head-group moieties. PFAS breakthrough in GAC and IX was dictated by chain length (C4>C6>C8) and functional group (PFCAs>PFSAs) of the compound. Shorter-chain PFAS broke through earlier than the longer chain, and removal trends were related to the hydrophobicity of PFAS. Overall, single-use IX performed superior to any of the evaluated GACs across a range of water chemistries in Arizona GWs.
ContributorsVenkatesh, Krishishvar (Author) / Westerhoff, Paul (Thesis advisor) / Sinha, Shahnawaz (Committee member) / Lind, Marylaura (Committee member) / Arizona State University (Publisher)
Created2020
Description
This dissertation investigates how rural e-commerce survives and thrives in resource-scarce rural China in the contemporary era. Building upon literatures on developmental state, state capitalism, industrial policy, and platform economy, this dissertation proposes a new theoretical framework, termed Digital Developmental Village, to understand China’s rural e-commerce development against rural China’s broader socioeconomic and politico-institutional contexts and the evolution of China’s political economy by underscoring three levels of interactions between the central government, local governments, e-commerce platform giants, and rural entrepreneurs.
This dissertation draws upon the data from in-depth interviews with different kinds of participants involved with e-commerce at different places in which e-commerce-related activities occur through multi-site fieldwork across six East China provinces, together with data from secondary data gathering, to scrutinize interactions of four parties at each level. At the national level, this dissertation investigates the coevolution of the Digital Developmental Village model and finds that the bureaucratic evolution and emergence of new economic sector initially created and subsequently developed by private actors will be eventually subjected to the influence of China’s state capitalism. At the local level, in consideration of the factors of local governance approach, the pre-existing robust local economic sectors, and migration patterns, this dissertation creates a typological framework to explore the formation of e-commerce villages in varied settings of the combinations of three factors above. At the individual level, this dissertation finds that rural e-commerce entrepreneurs may achieve economic successes through some more intense forms of embeddedness, which are deemed commercially unwise in the extant literature, within differing local socioeconomic and politico-institutional contexts in China. Lastly, this dissertation analyzes the expansion of the Communist Party of China into rural e-commerce in the business incubator role and sees such organizational expansion as the efforts to implicitly exercise control over rural e-commerce. In sum, through top-down policy directives and bottom-up party organizational expansion, the Chinese state has been gradually transforming rural e-commerce to a new form of state capitalism with potential global impacts, which can empower resource-scarce villages and infuse two kinds of industrial policies to stimulate technological advances.
This dissertation draws upon the data from in-depth interviews with different kinds of participants involved with e-commerce at different places in which e-commerce-related activities occur through multi-site fieldwork across six East China provinces, together with data from secondary data gathering, to scrutinize interactions of four parties at each level. At the national level, this dissertation investigates the coevolution of the Digital Developmental Village model and finds that the bureaucratic evolution and emergence of new economic sector initially created and subsequently developed by private actors will be eventually subjected to the influence of China’s state capitalism. At the local level, in consideration of the factors of local governance approach, the pre-existing robust local economic sectors, and migration patterns, this dissertation creates a typological framework to explore the formation of e-commerce villages in varied settings of the combinations of three factors above. At the individual level, this dissertation finds that rural e-commerce entrepreneurs may achieve economic successes through some more intense forms of embeddedness, which are deemed commercially unwise in the extant literature, within differing local socioeconomic and politico-institutional contexts in China. Lastly, this dissertation analyzes the expansion of the Communist Party of China into rural e-commerce in the business incubator role and sees such organizational expansion as the efforts to implicitly exercise control over rural e-commerce. In sum, through top-down policy directives and bottom-up party organizational expansion, the Chinese state has been gradually transforming rural e-commerce to a new form of state capitalism with potential global impacts, which can empower resource-scarce villages and infuse two kinds of industrial policies to stimulate technological advances.
ContributorsYou, Tianlong (Author) / Romero, Mary (Thesis advisor) / Jurik, Nancy (Committee member) / Zhou, Min (Committee member) / Arizona State University (Publisher)
Created2020
Description
C*-algebras of categories of paths were introduced by Spielberg in 2014 and generalize C*-algebras of higher rank graphs. An approximately finite dimensional (AF) C*-algebra is one which is isomorphic to an inductive limit of finite dimensional C*-algebras. In 2012, D.G. Evans and A. Sims proposed an analogue of a cycle for higher rank graphs and show that the lack of such an object is necessary for the associated C*-algebra to be AF. Here, I give a class of examples of categories of paths whose associated C*-algebras are Morita equivalent to a large number of periodic continued fraction AF algebras, first described by Effros and Shen in 1980. I then provide two examples which show that the analogue of cycles proposed by Evans and Sims is neither a necessary nor a sufficient condition for the C*-algebra of a category of paths to be AF.
ContributorsMitscher, Ian (Author) / Spielberg, John (Thesis advisor) / Bremner, Andrew (Committee member) / Kalizsewski, Steven (Committee member) / Kawski, Matthias (Committee member) / Quigg, John (Committee member) / Arizona State University (Publisher)
Created2020
Description
Nuclear Power Plants (NPP) have complex and dynamic work environments. Nuclear safety and organizational management rely largely on human performance and teamwork. Multi-disciplinary teams work interdependently to complete cognitively demanding tasks such as outage control. The outage control period has the highest risk of core damage and radiation exposure. Thus, team coordination and communication are critically important during this period. The purpose of this thesis is to review and synthesize teamwork studies in NPPs, outage management studies, official Licensee Event Reports (LER), and Inspection Reports (IRs) to characterize team brittleness in NPP systems. Focusing on team brittleness can provide critical insights about how to increase NPP robustness and to create a resilient NPP system. For this reason, more than 900 official LERs and IRs reports were analyzed to understand human and team errors in the United States (US) nuclear power plants. The findings were evaluated by subject matter experts to create a better understanding of team cognition in US nuclear power plants. The results of analysis indicated that human errors could be caused by individual human errors, team errors, procedural errors, design errors, or organizational errors. In addition to these, some of the findings showed that number of reactors, operation year and operation mode could affect the number of reported incidents.
ContributorsAKCA, SALLY SALIHA (Author) / Cooke, Nancy (Thesis advisor) / Niemczyk, Mary (Committee member) / Branaghan, Russell (Committee member) / Arizona State University (Publisher)
Created2020