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2,295 Matching Results
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Corrosion Mechanism and Prevention of Wire Bonded Device in Microelectronic Manufacturing and Spectroscopic Investigation of Copper Etch Chemical Equilibria for High Density Interconnect Application
In the first part of this dissertation work, Al bond pad corrosion behavior was investigated in the presence of common industrial contaminants such as chloride (Cl-) and fluoride (F-). Al corrosion while in direct contact with Cu displayed rapid hydrogen (H2) gas evolution and dendrite propagation. In contrast, Al without bimetallic contact showed only minor surface roughening. This observed difference in the corrosion mechanism between Cl- and F- is attributed to the solubility of the corrosion products (AlCl3 vs. AlF3) formed on the Al surface. Our subsequent work explored corrosion prevention inhibition of wire-bonded devices (WBD) in the Cl- environment. Our research shows that the Al bond pad was protected against corrosion by chemically modifying the surface of the Cu wires, thereby preventing the H2 evolution. The inhibitor was observed to be highly selective, thermally stable, hydrophobic, and cost-effective, making it viable for industrial application of this coating for Al bond pad corrosion prevention. In the second part of the dissertation work, we utilized a novel approach of using ultraviolet-visible spectroscopy (UV-Vis) as a chemical-sensitive monitoring tool of the chemical environment in Cu etch bath. The UV-Vis technique illuminates the roles of H+, Cl-, Cu+, and Cu2+ to the etch …
Date:
December 2021
Creator:
Ashok Kumar, Goutham Issac
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Modeling Email Phishing Attacks
Cheating, beguiling, and misleading information exist all around us; understanding deception and its consequences is crucial in our information environment. This study investigates deception in phishing emails that successfully bypassed Microsoft 365 filtering system. We devised a model that explains why some people are deceived and how targeted individuals and organizations can prevent or counter attacks. The theoretical framework used in this study is Anderson's functional ontology construction (FOC). The methodology involves quantitative and qualitative descriptive design, where the data source is the set of phishing emails archived from a Tier 1 University. We looked for term frequency-inverse document frequency (Tf-idf) and the distribution of words over documents (topic modeling) and found the subjects of phishing emails that targeted educational organizations are related to finances, jobs, and technologies. Also, our analysis shows the phishing emails in the dataset come under six categories; reward, urgency, curiosity, fear, job, and entertainment. Results indicate that staff and students were primarily targeted, and a list of the most used verbs for deception was compiled. We uncovered the stimuli being used by scammers and types of reinforcements used to misinform the target to ensure successful trapping via phishing emails. We identified how scammers pick their …
Date:
December 2021
Creator:
Almoqbil, Abdullah
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Understanding the RCS Way: A Study of Organizational Culture
The quality of workplace morale can positively and negatively affect employee engagement. Engaged employees are more likely to participate in active communication with one another. They are also more likely to adopt the organizational goals and work towards creating a productive work environment. Communication and engagement build trust. Established trust between employees and executive leadership is a delicate relationship to maintain, though it is necessary when contending with periods of stress. The organization profiled below experienced the stressor of needing to grow without alienating those afraid of change or used to operating in one predictable direction. There was a desire to generate engagement, build trust and make room for employee-directed change. This desire left the organization open to exploring its culture and its impact on employee engagement.
Date:
December 2021
Creator:
Terry, Vanessa S.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Rethinking Tenure: Abolish, strengthen, or replace it?
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Use of this item is restricted to the UNT Community
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Date:
2021
Creator:
Chronicle of Higher Education, Inc.
Object Type:
Text
System:
The UNT Digital Library
Regulation of Receptors in Neuronal Cilia with Development, Seizures, and Knockouts: Implications for Excitability
Neurons commonly have a primary cilium, which is a non-motile organelle extending from the centrosome into the extracellular space. In most brain regions, neuronal cilia are enriched in either somatostatin receptor type 3 (SstR3) or melanin concentrating hormone receptor type 1 (MCHR1), or both. The present immunohistochemical study provides novel evidence that primary cilia regulate neuronal excitability via G-protein coupled receptors (GPCRs), and that their identity is governed by brain region and by competition, both in adulthood and in postnatal development. The hippocampus, which is particularly vulnerable to seizures, has opposing gradients of SstR3(+) and MCHR1(+) ciliary GPCRs. We hypothesized that there is a competition between these two ciliary GPCRs, which might take place on any level from gene expression to presence in the cilium. We examined whether receptor colocalization occurs transiently in development before ciliary GPCR dominance is established in neurons in the CNS. In postnatal CA1 and CA3, the first GPCR to appear in cilia was the one that will dominate in adults: MCHR1 in CA1 and SstR3 in CA3. Some days later, the second GPCR was expressed along with the first; dual-receptor cilia were the exclusive type until single-receptor cilia emerged again around P14. Single-receptor cilia then …
Date:
August 2022
Creator:
Shrestha, Jessica
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Inferring a Network of Horizontal Gene Flow among Prokaryotes Using Complementary Approaches
Horizontal gene transfer (HGT), a mechanism that facilitates exchange of genetic material between organisms from different lineages, has a profound impact on prokaryotic evolution. To infer HGT, we first developed a comparative genomics-based tool, APP, which can perform phyletic pattern analysis using completely sequenced genomes to identify genes are unique to a genome or have sporadic distribution in its close relatives. Performance assessment against currently available tools on a manually created 18-genome dataset and 2 benchmarking datasets revealed the superior accuracy of APP over other methods. We then utilized a parametric method to construct a gene exchange network. The composition-based method, Jenson-Shannon Codon Bias (JS-CB), groups genes into clusters based on similar codon usage bias. These clusters were analyzed using APP and examined for the enrichment HGT associated marker genes, then annotated as of native or alien origin based on these multiple lines of evidence. Intergenome clustering enabled identification of genes mobilized across alien components of the genomes (alien-alien transfer) and from native components of donor genomes to the recipient genomes (native-alien transfer). Functional classification of alien gene clusters revealed that metabolism associated genes are most frequently mobilized, in concurrence with previous reports, and additionally, a large number of genes …
Date:
August 2022
Creator:
Sengupta, Soham
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Mixed Reality Tailored to the Visually-Impaired
The goal of the proposed device and software architecture is to apply the functionality of mixed reality (MR) in order to make a virtual environment that is more accessible to the visually-impaired. We propose a glove-based system for MR that will use finger and hand movement tracking along with tactile feedback so that the visually-impaired can interact with and obtain a more detailed sense of virtual objects and potentially even virtual environments. The software architecture makes current MR frameworks more accessible by augmenting the existing software and extensive 3D model libraries with both the interfacing of the glove-based system and the audibly navigable user interface (UI) of a virtual environment we have developed. We implemented a circuit with finger flexion/extension tracking for all 5 fingers of a single hand and variable vibration intensities for the vibromotors on all 5 fingertips of a single hand. The virtual environment can be hosted on a Windows 10 application. The virtual hand and its fingers can be moved with the system's input and the virtual fingertips touching the virtual objects trigger vibration motors (vibromotors) to vibrate while the virtual objects are being touched. A rudimentary implementation of picking up and moving virtual objects inside …
Date:
August 2022
Creator:
Omary, Danah M
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
On the Descriptive Complexity and Ramsey Measure of Sets of Oracles Separating Common Complexity Classes
As soon as Bennett and Gill first demonstrated that, relative to a randomly chosen oracle, P is not equal to NP with probability 1, the random oracle hypothesis began piquing the interest of mathematicians and computer scientists. This was quickly disproven in several ways, most famously in 1992 with the result that IP equals PSPACE, in spite of the classes being shown unequal with probability 1. Here, we propose what could be considered strengthening of the random oracle hypothesis, using a stricter notion of what it means for a set to be 'large'. In particular, we suggest using largeness with respect to the Ramsey forcing notion. In this new context, we demonstrate that the set of oracles separating NP and coNP is 'not small', and obtain similar results for the separation of PSPACE from PH along with the separation of NP from BQP. In a related set of results, we demonstrate that these classes are all of the same descriptive complexity. Finally we demonstrate that this strengthening of the hypothesis turns it into a sufficient condition for unrelativized relationships, at least in the three cases considered here.
Date:
August 2022
Creator:
Creiner, Alex
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Advanced Stochastic Signal Processing and Computational Methods: Theories and Applications
Compressed sensing has been proposed as a computationally efficient method to estimate the finite-dimensional signals. The idea is to develop an undersampling operator that can sample the large but finite-dimensional sparse signals with a rate much below the required Nyquist rate. In other words, considering the sparsity level of the signal, the compressed sensing samples the signal with a rate proportional to the amount of information hidden in the signal. In this dissertation, first, we employ compressed sensing for physical layer signal processing of directional millimeter-wave communication. Second, we go through the theoretical aspect of compressed sensing by running a comprehensive theoretical analysis of compressed sensing to address two main unsolved problems, (1) continuous-extension compressed sensing in locally convex space and (2) computing the optimum subspace and its dimension using the idea of equivalent topologies using Köthe sequence. In the first part of this thesis, we employ compressed sensing to address various problems in directional millimeter-wave communication. In particular, we are focusing on stochastic characteristics of the underlying channel to characterize, detect, estimate, and track angular parameters of doubly directional millimeter-wave communication. For this purpose, we employ compressed sensing in combination with other stochastic methods such as Correlation Matrix Distance …
Date:
August 2022
Creator:
Robaei, Mohammadreza
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Relationship between Self-Regulated Learning Strategies and Licensing Exam Readiness among Doctor of Chiropractic Students
Graduating competent healthcare providers to meet increasing demands of the United States leads to interest in graduate health science student success. In this study, I explored the relationship between self-regulated learning strategies and licensing exam readiness among Doctor of Chiropractic students. Two research questions asked (1) how self-regulated learning strategies vary by gender and year of study, and (2) how self-regulated learning strategies relate to licensing exam readiness. One hundred thirty-three students from five chiropractic institutions were surveyed with questions from the Motivated Strategies for Learning Questionnaire (MSLQ) and exam readiness items. A series of t-tests, one-way analyses of variance, Kruskal-Wallis H tests, and ordinary least squares (OLS) regression addressed the research questions. Results indicated (1) self-regulated learning strategies do vary by gender and year of study, and (2) self-regulation is related to licensing exam readiness, particularly in Parts I and II of the exam. Chiropractic institutions and policymakers should focus efforts on introducing and reinforcing self-regulated learning strategies throughout the curriculum and explore licensing exam implications. Future research should continue expanding the literature on chiropractic education by considering actual licensing exam performance and determining appropriateness of the MSLQ for chiropractic students.
Date:
August 2022
Creator:
Long, Ashley Nicole
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Characteristics, Expectations, and Challenges of Non-Traditional Adult First-Generation Students
The purpose of this phenomenological study was to explore the lived experiences of adult first-generation students through their college journey. With a conceptual framework based on student involvement and social and cultural capital theories that contribute to student persistence, retention, and graduation, this study was guided by three research questions: (1) What were the expectations and motivations of adult first-generation students when pursuing postsecondary studies after the age of 25? (2) What were the main challenges experienced by this population during their journey through college? and (3) What strategies did these students use to cope with those challenges? Five first-generation participants who started or resumed their college careers when they were 27, 34, 47, and 50 years old were interviewed in-depth. Results indicated that all participants had to search for their inner strength to pursue higher education studies and required the support of their family and social network to succeed. As a result of their rich lived experiences, these adult first-generation students showed how their strong social and cultural capital enabled them to juggle family and work responsibilities and overcome the challenges of their college experiences.
Date:
August 2022
Creator:
Fleurquin, Fernando
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Investigation of Structure-Property Effects on Nanoindentation and Small-Scale Mechanical Testing of Irradiated Additively Manufactured Stainless Steels
Additively manufactured (AM) 316L and 17-4PH stainless steel parts, concretely made by laser powder bed fusion (L-PBF), are characterized and micro-mechanical properties of those steels are analyzed. This study also explored and extended to proton irradiation and small-scale mechanical testing of those materials, to investigate how irradiation affects microstructural evolution and thus mechanical properties at the surface level, which could be detrimental in the long term in nuclear applications. In-depth anisotropy analysis of L-PBF 316L stainless steel parts with the variations of volumetric energy density, a combined study of nanoindentation with EBSD (electron backscatter diffraction) mapping is shown to be an alternative methodology for enriching qualification protocols. Each grain with a different crystallographic orientation was mapped successfully by proper indentation properties. <122> and <111> oriented grains displayed higher than average indentation modulus and hardness whereas, <001>, <101>, and <210> oriented grains were found to be weaker in terms of indentation properties. Based on an extensive nanoindentation study, L-PBF 17-4 PH stainless steels are found to be very sensitive to high load rates and irradiation further escalates that sensitivity, especially after a 0.25 s-1 strain rate. 3D porosity measurement via X-ray microscope ensures L-PBF stainless steel parts are of more than …
Date:
August 2022
Creator:
Uddin, Mohammad Jashim
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Stem Cell Regulation Using Nanofibrous Membranes with Defined Structure and Pore Size
Electrospun nanofibers have been researched extensively in the culturing of stem cells to understand their behavior since electrospun fibers mimic the native extracellular matrix (ECM) in many types of mammalian tissues. Here, electrospun nanofibers with defined structure (orientation/alignment) and pore size could significantly modulate human mesenchymal stem cell (hMSC) behavior. Controlling the fiber membrane pore size was predominantly influenced by the duration of electrospinning, while the alignment of the fiber membrane was determined by parallel electrode collector design. Electric field simulation data provided information on the electrostatic interactions in this electrospinning apparatus.hMSCs on small-sized pores (~3-10 µm²) tended to promote the cytoplasmic retention of Yes-associated protein (YAP), while larger pores (~30-45 µm²) promoted the nuclear activation of YAP. hMSCs also displayed architecture-mediated behavior, as the cells aligned along with the fiber membranes orientation. Additionally, fiber membranes affected nuclear size and shape, indicating changes in cytoskeletal tension, which coincided with YAP activity. The mechanistic understanding of hMSC behavior on defined nanofiber structures seeks to advance their translation into more clinical settings and increase biomanufacturing efficiencies.
Date:
August 2022
Creator:
Blake, Laurence A
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Motivic Stratification in Fauré's Late Chamber Works: Perspectives on Voice Leading and Tonal Coherence
This dissertation argues how motivic saturation on the musical surface complicates a conventional harmonic interpretation in Fauré's late chamber works. Using motivic segmentation and linear analysis, I illustrate how the abundance of foreground motives has far-reaching implications for tonal voice leading and overall coherence. The outcomes of motivic saliency are twofold, influencing harmonic progressions by 1) altering traditional syntax or 2) replacing traditional syntax to provide the primary form of tonal coherence. I unpack the voice-leading consequences of stratifying motives over one another and bring in two larger, emerging concepts: 1) key duality as disjunction between melody and bass and 2) tonal coherence from the tonal profile of motives. In the first case, either the melody or the bass projects its own center or key separate from the other parts, producing a sensation of key duality. In the second, a single motive furnishes the main source of tonal grounding by unfolding a structural harmony that the surface sonorities obscure. While motivic saliency is a consistent trait across Fauré's late repertoire, the two phenomena above increase over time.
Date:
August 2022
Creator:
Bilik, Matthew Allan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Development of an Interpolation-Free Sharp Interface Immersed Boundary Method for General CFD Simulations
Immersed boundary (IB) methods are attractive due to their ability to simulate flow over complex geometries on a simple Cartesian mesh. Unlike conformal grid formulation, the mesh does not need to conform to the shape and orientation of the boundary. This eliminates the need for complex mesh and/or re-meshing in simulations with moving/morphing boundaries, which can be cumbersome and computationally expensive. However, the imposition of boundary conditions in IB methods is not straightforward and numerous modifications and refinements have been proposed and a number of variants of this approach now exist. In a nutshell, IB methods in the literature often suffer from numerical oscillations, implementation complexity, time-step restriction, burred interface, and lack of generality. This limits their ability to mimic conformal grid results and enforce Neumann boundary conditions. In addition, there is no generic IB capable of solving flow with multiple potentials, closely/loosely packed structures as well as IBs of infinitesimal thickness. This dissertation describes a novel 2$ ^{\text{nd}} $ order direct forcing immersed boundary method designed for simulation of two- and three-dimensional incompressible flow problems with complex immersed boundaries. In this formulation, each cell cut by the IB is reshaped to conform to the shape of the IB. IBs …
Date:
August 2022
Creator:
Kamau, Kingora
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Politics of Fiscal Federalism and Building the Foundations of the Putin Regime in Russia, 2007-2013
Putin's military forces invaded Ukraine on February 24, 2022, sparking a renewed academic interest in Russia's current regime. Several scholars suggested that a critical period in the construction of the current regime occurred between 1999-2013 during Putin's first two presidencies followed by the Medvedev presidency. This is when the basic institutions of the current Russian political system were changed to recentralize state authority and prevent Russian Federation from looming disintegration. One such institution was the budgetary process. Signed into law in 1998, Russian Budget Code established how funds were disbursed from the "center" to the federal "subjects" and other entities. Many scholars have pointed out that one specific mechanism, namely "Intergovernmental Transfers", can be used to achieve the political goals of a regime by rewarding supporters, swinging the competitive electoral districts, or appeasing the opposition or separatist regions. The goal of this dissertation to investigate under what conditions a non-democratic regime, like Russia, uses these strategies for political effect? Do those strategies change over time? In this work, I develop a basic theoretical framework outlining such conditions and test it using the municipal-level data gathered from the Russian Federal State Statistics Service and Central Election Commission of the Russian Federation.
Date:
August 2022
Creator:
Pechenina, Anna
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Minority Linked Fate and Race-Based Policy Initiatives: Analyzing Support Levels for African American Redress between Asian, Latino, and African Americans
This thesis seeks to examine the levels of support for African American reparations amongst minorities. After providing a historical account of redress efforts separated racial group and discussing factors that influence reparations, I argue that minority groups possess cross-racial linked fate (minority linked fate) that significantly impacts their political attitudes concerning reparations for African Americans. Additionally, I argue that higher levels of minority-linked fate will equate to significant support for reparations. The probit regressions reaffirm the initial hypotheses that minority-linked fate has a significant impact on support for African American reparations. However, the racial groups most affected were not suspected initially.
Date:
August 2022
Creator:
Ferguson, Triston
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Artificial Neural Network Based Thermal Conductivity Prediction of Propylene Glycol Solutions with Real Time Heat Propagation Approach
Machine learning is fast growing field as it can be applied to solve a large amount of problems. One large subsection of machine learning are artificial neural networks (ANN), these work on pattern recognition and can be trained with data sets of known solutions. The objective of this thesis is to discuss the creation of an ANN capable of classifying differences in propylene glycol concentrations, up to 10%. Utilizing a micro pipette thermal sensor (MTS) it is possible to measure the heat propagation of a liquid from a laser pulse. The ANN can then be trained beforehand with simulated data and be tested in real time with temperature data from the MTS. This method could be applied to find the thermal conductivity of unknown fluids and biological samples, such as cells and tissues.
Date:
August 2022
Creator:
Jarrett, Andrew Caleb
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Some Things Change and the News Stays the Same: Contextual Factors of Mainstream News Viewing and Racial Attitudes
Considerable media research has established that much of mainstream, United States based news is historically rife with content that both implicitly and explicitly reinforces popular cultural norms. Combined with a history full of inequities towards marginalized groups, many of which were based on race, consumption of mainstream news has been linked to increased hostility and more negative attitudes towards non-Whites in the United States. That said, much of this work views news from a monolithic perspective of news programming, irrespective of the differences in political orientation or broadcast integrity. By using quantitative assessments of how various mainstream news programs score on both left/right and fact/opinion-based dichotomies, the purpose of the present study is to address these gaps. As models for how mainstream news consumption is related to existing race-related attitudes, theoretical foundations of cultivation theory (how long viewers watch), the motivation and opportunities model (if viewers are motivated in their viewing) and social ecology theory (who viewers are), were used in relation to these dichotomies. However, overall results suggest that, while time spent with news, race, and gender appear to affect news consumption's relationship with race-related attitudes, preference for left vs. right wing news and fact vs. opinion-based was less …
Date:
August 2022
Creator:
Archibald, Audon
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Texu Kim's "Le Temps Déformé for Solo Flute, Percussion and Strings": Background and Analysis
The purpose of this dissertation is to introduce Le Temps Déformé for solo flute, percussion, and strings, composed by Korean American composer Texu Kim (b. 1980) in 2017. The dissertation includes an analysis of the work and its background, to show that it represents a significant expansion of the concerto repertoire for solo flute and to help performers interpret it. This piece of writing should also contribute to the available sources about the composer Texu Kim, given that it is the first dissertation about him or his work. This piece should be appropriate for flutists who are seeking to perform a new piece with orchestra. Although hundreds of concertos have been written for solo flute and orchestra or string orchestra, Kim uses the unusual instrumentation of strings and percussion (drum and triangle) without woodwinds and brass. In a program note, the composer mentions that he made use of Korean traditional music, Sujecheon, which has similar instrumentation. The note also discusses he transformed and interpreted Korean traditional music to create a new interaction with Western music.
Date:
August 2022
Creator:
Lee, Jeong Hoon
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Consider the View (La Due)
Visual impairment/blindness is not often discussed in a media space, and the community is often left out and forgotten otherwise in the course of history. Through documentary filmmaking, Consider the View (La Vue) provides an artistic exploration of blindness by using the camera as optical power and other forms of art. Viewers experience a new perspective of what it means to be visually impaired.
Date:
August 2022
Creator:
Jordan, Tamia Chantel
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Johann Sebastian Bach's Partita for Solo Flute, BWV 1013 Transcribed and Arranged for Guitar: A Musico-Rhetorical Performance Guide
The main purpose of this dissertation is to offer classical guitarists an additional analytical technique for interpreting and performing the music of Johann Sebastian Bach. While this mode of analysis can be successfully applied to any of the instrumental works by Bach frequently transcribed and performed by guitarists, I have chosen for this study my recent transcription of the Partita in A minor for solo flute traverso, BWV 1013. With a continuo-based, harmonic realization of the Partita, I contribute to the existing guitar repertoire by offering a new transcription of this work, while demonstrating how historical concepts of rhetorical structure and aesthetics found in relevant primary source material can inspire a new approach to analysis, transcription, and performance practice. In this way, my investigations create additional perspectives for classical guitarists regarding the analysis and performance of this work, while complementing traditional harmonic analysis and subject labeling. Although it is my hope that this new transcription of the Partita will serve as an important contribution to the existing literature, the main purpose of this dissertation resides in the musico-rhetorical analytical technique and its implications on performance practice for classical guitarists.
Date:
August 2022
Creator:
Burns, Bryan Keith
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Microgravity Vortex Phase Separator for Liquid Amine CO2 Removal System
The present study investigates vortex phase separator (VPS) technology as a new approach for a liquid amine CO2 removal system. Experimental results obtained using a 99.99% pure CO2 stream and liquid amine with varying concentrations demonstrate the VPS' ability to decrease CO2 volume at its gas outlet. Operating parameters such as CO2 flow rate, relative humidity (RH), and temperature were systematically varied during experimental procedure, as well as working fluid temperature, volume, and flow rate. The subscale design for a VPS with a 3" inner diameter, 3.5" outer diameter, and 3.63" height removed a maximum of 84% of CO2 from a CO2 stream at 3.7 SCFH flow rate, 14°C temperature, and 82% RH, using 100 mL of 100% amine circulated at 1.52 LPM flow rate. The designed VPS also showed to be effective in removing relative humidity of the CO2 stream by up to 26% for the stated parameters. Regeneration of liquid amine in the VPS system is also proposed to allow for continuous CO2 removal. The results obtained in this work characterize the VPS system for CO2 removal in terms of various operating parameters for the gas (CO2) and liquid (liquid amine) phases, as well as provide initial insights …
Date:
August 2022
Creator:
Sarvadi, Alexander Armstrong
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Optimizing Value Co-Creation in Education Supply Chains: An Evaluation of Determinants and Resiliency in Service Systems
Services and service-based business are a major part of any economy. However, service-based supply chains require a greater level of interaction between provider and consumer than the traditional manufacturing or product-based supply chain. Therefore, they require optimization and resiliency models that acknowledge the constraints and goals unique to service-based industries. Value co-creation and service-dominant logistics (SDL) are relatively new to operations research. Existing literature in management science provides a framework for value co-creation but does not provide a model for optimizing value cocreation and resiliency in a complex or dynamic systems such as education supply chains (ESC). This dissertation addresses these knowledge gaps through 3 essays. The first essay establishes a method for optimizing investment in resiliency measures when utilizing parallel supply chains. The essay examines the intersection of value co-creation theory between higher education and service-dominant logistics (SDL) to understand the role of supply chain elements in value cocreation. The second essay provides a theoretical approach to incorporating resilience planning into the customer relationship management model. The final essay establishes a method for optimizing investment in resiliency measures when utilizing parallel service supply chains.
Date:
August 2022
Creator:
Smith, Justin Thomas
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library