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Deep Minima and Vortices for Positronium Formation in Positron-Hydrogen and Positron-Helium Collisions
This dissertation work is a study of positronium formation for positron-hydrogen and positron-helium collisions in the Ore gap (the energy region between the threshold for ground-state positronium formation and the first excitation level of the target atom) using variational K-matrices. We have fitted the K-matrices using multichannel effective range theories and using polynomials. Using the variational K-matrices and their fits, we have located zeros in the positronium-formation scattering amplitude and corresponding deep minima in the positronium-formation differential cross section. The zeros are related to the vortices in the extended velocity field associated with the positronium-formation scattering amplitude. For positron-hydrogen collisions, we have found two zeros in the positronium-formation scattering amplitude, and corresponding deep minima in the positronium-formation differential cross section, while we have obtained a zero in the positronium-formation scattering amplitude for positron-helium collisions. We have connected the zeros in the positronium-formation scattering amplitude to vortices in the extended velocity fields. Our work shows that vortices can occur for charge exchange in atomic collisions.
Date:
May 2021
Creator:
Alrowaily, Albandari Wanes
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Quantifying the Effects of Single Nucleotide Changes in the TATA Box of the Cauliflower Mosaic Virus 35S Promoter on Gene Expression in Arabidopsis thaliana
Synthetic biology is a rapidly growing field that aims to treat cellular biological networks in an analogous way to electrical circuits. However, the field of plant synthetic biology has not grown at the same pace as bacterial and yeast synthetic biology, leaving a dearth of characterized tools for the community. Due to the need for tools for the synthetic plant biologist, I have endeavored to create a library of well-characterized TATA box variants in the cauliflower mosaic virus (CaMV) 35S promoter using the standardized assembly method Golden Braid 2.0. I introduced single nucleotide changes in the TATA box of the CaMV 35S promoter, a genetic part widely used in plant gene expression studies and agricultural biotechnology. Using a dual-luciferase reporter system, I quantified the transcriptional strength of the altered TATA box sequences and compared to the wild-type sequence, both in transient protoplast assays and stable transgenic Arabidopsis thaliana plants. The library of TATA-box modified CaMV 35S promoters with varying transcriptional strengths created here can provide the plant synthetic biology community with a series of modular Golden Braid-adapted genetic parts that can be used dependably and reproducibly by researchers to fine-tune gene expression levels in complex, yet predictable, synthetic genetic circuits.
Date:
December 2021
Creator:
Amack, Stephanie Carolina
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Southwest Retort, Volume 73, Number 5, January 2021
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
January 2021
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Southwest Retort, Volume 73, Number 7, March 2021
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
March 2021
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Southwest Retort, Volume 73, Number 8, April 2021
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
April 2021
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Southwest Retort, Volume 73, Number 9, May 2021
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
May 2021
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Southwest Retort, Volume 74, Number 1, September 2021
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
September 2021
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Southwest Retort, Volume 74, Number 2, October 2021
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
October 2021
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Southwest Retort, Volume 74, Number 3, November 2021
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
November 2021
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
A Behavior Analytic Account of Humor Responses: Taking a Joke Way Too Seriously
Compared to other examples of human behavior, humor responses have received relatively little attention from the scientific community and by the behavior analytic community in particular. This study investigated what some of the controlling variables for humans to emit a humor response may be. Participants were randomly presented two types of word sequences/jokes: one with a matching punchline and one without a matching punchline. Participants rated whether the jokes were funny or not funny, and reaction time was measured for all stimuli presented. Generally, the results showed that reaction times to punchlines rated as not funny were shorter than punchlines that were rated funny. These differences in reaction time were interpreted with priming, intraverbal control, and multiple control as an experimental foundation. Limitations include the absence of physiological measures due to COVID-19 restrictions and the forced choice of two rating responses. The implications of this research reveal opportunities for future research of humor responses.
Date:
December 2021
Creator:
Amezquita IV, Edward Brandon
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
3D Printing of Zinc Anode for Zinc Ion Batteries
Recently, 3D printing has received increasing attention for the fabrication and assembly of electrodes for batteries due to the freedom of creating structures in any shape or size, porosity, flexibility, stretchability, and chemistry. Particularly, zinc ion batteries (ZIBs) are favored due to high safety, cheap materials cost, and high volumetric capacity (5,849 mAh/cm3), however, rapid evaporation of Zn due to low melting temperature has limited its 3D printability via conventional laser-based additive manufacturing technique. Here, we develop a printable ink for the fabrication of flexible and 3D printed Zn anode with varied surface areas using the direct ink writing (DIW) method. Our 3D printed porous and high surface area Zn anode structures effectively suppressed the dendrite growth while providing high Zn ion diffusion towards the cathode to significantly enhance the performance of ZIB. By varying filament distancing and path, we 3D printed zinc anode structures with different active surface areas, surface area to volume ratio, porosity, flexible and multiple layer structures that can be incorporated on any device. Carbon in the composite improved conductivity, and mechanical stability of 3D printed zinc anode. Our 3D printed composite anodes allowed flexible designing of batteries surpassing conventional battery designs such as coin cells …
Date:
December 2021
Creator:
Amoko, Stephen Adot Oyo
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Speech-in-Noise Processing in Adults with Autism Spectrum Disorder
Individuals diagnosed with autism spectrum disorder often experience difficulty during speech-in-noise (SIN) processing tasks. However, it remains unclear how behavioral and cortical mechanisms of auditory processing explain variability in SIN performance in adults with ASD and their neurotypical counterparts. The proposed research explored variability in SIN as it relates to behavioral, perceptual, and objective measures of auditory processing. Results showed significant differences between groups in SIN thresholds. In addition, neurotypicals outperformed the ASD group on measures of sustained auditory attention characterized by reduced impulsivity, increased inhibition, and increased selective auditory attention. Individuals with ASD showed decreased acceptance of noise as compared to neurotypical peers. Overall, results highlighted auditory processing deficits in individuals with ASD that contribute to SIN performance.
Date:
August 2021
Creator:
Anderson, Chelsea D
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Proposal for a Training Program to Support Culturally Responsive Professional-Family Interactions
Behavior analysts often work with families from diverse cultural backgrounds. Ideally, behavior analysts and families interact in ways that are responsive to the family's culture and valued outcomes. The data indicate that most behavior analysts, however, come from one dominant cultural group. This is a proposal for training program and evaluation method to support culturally responsive professional-family interactions. This proposed study is designed to be conducted via Zoom-- a cloud-based video conferencing service. A pre-post treatment design is proposed to assess the effects of the training. Hypothetical data were generated to consider the range of effects such a program might have on trainee responses to written/live scenarios. Responses in the observation protocol included written descriptions, empathetic statements, perspective taking statements, and non-verbal behaviors. Overall, the program was designed using evidence-based procedures and is likely to support behavior analysts in training and in practice to improve their interactions with families and become more culturally responsive to groups of people that are from the non-dominant culture.
Date:
December 2021
Creator:
Anegbeh, Cynthia Momoh
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Instrumental Development and Implementation of Portable Membrane Inlet Mass Spectrometry for Homeland Security and Environmental Applications
A rapidly growing topic of great interest is the adaptation of benchtop analytical instrumentation for use in outdoor harsh environments. Some of the areas that stand to benefit from field instrumentation development include government agencies involved with the preservation of the environment and institutions responsible for the safety of the general public. Detection systems are at the forefront of the miniaturization movement as the interest in analyte identification and quantitation appears to only be accessible through the use of analytical instrumentation. Mass spectrometry is a distinguished analytical technique known for its ability to detect the mass-to-charge (m/z) ratios of gas-phase ions of interest. Although these systems have been routinely limited to research lab-based analysis, there has been considerable development of miniaturized and portable mass spectrometry systems. Membrane Inlet Mass Spectrometry (MIMS) is becoming a common method of sample introduction that is subject to significant development. MIMS allows for minimal sample preparation, continuous sampling, and excludes complicated analyte introduction techniques. Sampling is accomplished using a semipermeable membrane that allows selective analyte passage into the vacuum of the mass spectrometer. MIMS is becoming the preeminent choice of homeland security and environmental monitoring applications with increasing opportunities for the future development of specialized …
Date:
December 2021
Creator:
Anguiano Virgen, Camila
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Behind the Curtain of Public Space: Revealing the Narratives of Corporate Street Hawking in Globalizing Accra
All street hawkers are not the same in many Newly Industrialized Countries (NICs) of the global south as often portrayed by the media and documented in extant literature. This perception has created a gap in knowledge as researchers explore street hawking activities in NICs. In this study, I investigated a new informality trend of street hawking is coming into being within the capital city of Accra, Ghana. As governance is increasingly becoming entrepreneurial, informal activities are gradually becoming formal. Formal and registered businesses are increasingly capitalizing on hawking activities to occupy public spaces. The advent of the informality trend, I term corporate street hawking opens up new issues for the political economy, labor, and urban studies. By employing semi-structured interviews with 47 street hawkers in Accra, this paper sought to investigate three broadly interrelated questions. First, how do neoliberal policies impact the production of public space in Accra? Second, is corporate street hawking a form of creative destruction? Finally, how do corporate street hawkers practice agency within Accra?
Date:
December 2021
Creator:
Ansah, Hilary Ama
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Three Essays on Harmony in Intrapersonal Identity Networks
Drawing attention to an under-examined process during organizational socialization, we develop theory to explain how newcomers' new organizational roles and social identities become embedded. The process of identities becoming embedded is influenced by how an individual's preexisting identities interact with new organizational identities during socialization. Perceived harmony relationships among identities indicate if newcomers experience identities interacting in a positive or negative manner generally. Using a network perspective, we suggest that the identity embeddedness of new roles and identities are indicated by: degree centrality in an intrapersonal identity harmony network, perceived harmony with the network itself, and the perceived cost of lacking harmony with a focal identity. Newcomers are likely to be more satisfied and engaged with identities with greater embeddedness as well as find such identities more salient. Organizations can work to embed their employees' new identities through initiating identity work directed towards increasing harmony perceptions among the newcomers' new organizational identities and preexisting identities. Through helping individuals create harmony relationships among identities, organizations can improve socialization outcomes.
Date:
August 2021
Creator:
Anzollitto, Peter
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Ends of Smaller Worlds
The Ends of Smaller Worlds is a collection of short stories set in Indiana. The preface is about the representation of the information age using elements of dirty realism and Gothic fiction.
Date:
May 2021
Creator:
Armes, Brett
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
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
Digital Readiness Assessment of Countries in Africa: A Case Study Research
Conference paper seeking to answer these questions: What is the current state of digital readiness in African countries? Do existing digital readiness assessment tools, indicators, or metrics, help to assess the digital readiness of countries in Africa?
Date:
October 13, 2021
Creator:
Assefa, Shimelis; Rorissa, Abebe & Alemneh, Daniel Gelaw
Object Type:
Paper
System:
The UNT Digital Library
Exploring the Impacts of Social Media Use on Young Adults' Self-Esteem and Perceived Impact on Psychological Diagnoses or Emotional Disturbance Eligibility
The impacts of emerging adults' social media use have been shown as generally negative, especially in decreasing their self-esteem and self-concept and increasing anxiety, depression, and more. Although there is research on social media's impact on various communities of adolescents and young adults, limited research has focused on this effect for young adults with mental health diagnoses or served under IDEA's emotional disturbance eligibility criteria. Additionally, no research has studied this topic during the COVID-19 pandemic. Therefore, the purpose of the current study is to examine how various types of social media use impact young adults' self-esteem, including those who are psychologically vulnerable. Participants included 119 individuals, 18 to 19-years of age, with and without mental health diagnoses or Emotional Disturbance special education eligibility recruited utilizing social media pages and social media hashtags. Participating individuals answered demographic and social media use questions and completed the Rosenberg Self-Esteem Scale to provide information about self-esteem. Additionally, participants responded to questions regarding what role they feel social media use has had on their mental health, including contribution to or exacerbating their symptoms. Univariate statistics were run to control demographic factors and determine the percentage of participants who believe social media has negatively affected …
Date:
August 2021
Creator:
Atkinson, Rebecca Lynn
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Increasing Mother and Child Safety: Social Factors Influencing Help Seeking Behaviors amongst Child Welfare-Involved Women Experiencing Family Violence
The purpose of this study is to determine social factors that influence help seeking behaviors by mothers who are concurrently involved in two social service systems: Child Protective Services (CPS) and family violence advocacy programs. Through the application of the behavioral model (of service use) for vulnerable populations, this study seeks to determine predisposing, enabling and need characteristics that impact help seeking behaviors at a family violence agency after participation in an ADVANCE (Acknowledging Domestic Violence and Navigating Child Protection Effectively) course, a group intervention class developed specifically for women involved with CPS. The research design is a mixed-method approach with an ADVANCE course evaluation embedded within the overall analysis of help seeking behaviors. The analytic strategies include pre-test/post-test means comparisons through paired t-tests, qualitative thematic analysis through arts-based methodology, and ordinary least squares and logistic regression analysis. This study considers six outcome variables related to protective help seeking behaviors: seeking services, seeking protective actions related to children, seeking a safety plan, seeking a protective order, seeking safe housing, and seeking financial independence. Several social factors identified influenced help seeking behaviors amongst child welfare involved women experiencing violence, namely, number of children, age of children, level of interest in services, …
Date:
August 2021
Creator:
Baker, Cassidy A.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Investigation of Porous Ceramic Structure by Freeze-Casting
The design and fabrication of porous ceramic materials with anisotropic properties has, in recent years, gained popularity due to their potential application in various areas that include medical, energy, defense, space, and aerospace. Freeze-casting is an effective, low-cost, and safe method as a wet shaping technique to create these structures. To control the morphology of these materials, many critical factors were found to play an important role. In this dissertation, the processing parameters of the magnetic field-assisted freeze-casting method were optimized with a focus on comparing the structure obtained using vertical and horizontal magnetic fields and understanding the mechanisms that occur under different freezing modes. More specifically, this processing method was used to produce Al2O3 and B4C porous ceramics materials with unidirectionally-aligned pore channels. The effect of the vertical and horizontal magnetic field strength and direction, concentration of magnetic material (Fe3O4), cooling rate, and freezing time were examined. The resulting ceramics with highly aligned pore channels were infiltrated with molten metal to create metal matrix composites. The mechanical properties of these structures were measured and were subsequently correlated to their morphology and composition.
Date:
May 2021
Creator:
Bakkar, Said Adnan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
"The Other Half is Mine": Charlotte Moorman as an Architect of the Avant-Garde
Charlotte Moorman (1933–1991) was a Juilliard-trained cellist whose life and work made an indelible mark on the development of the American avant-garde. In her career, Moorman acted as a performer, collaborator, composer, administrator and muse. She solely founded the inaugural New York Avant Garde Festival, and subsequently directed fifteen of these festivals between 1963 and 1980, the feat for which she is most widely acknowledged today. Yet, her revolutionary performance practice, which blurred the lines between her life, her body, and her work, and brought into focus the dynamics of corporeality, the feminine body, female nudity and sexuality, and gendered politics within the contexts of musical performance, has so far escaped serious consideration in the written histories of the American avant-garde. This dissertation describes the nature of Moorman's practice as one that evolved to become inherently and irrevocably embodied, explores how this approach fell at odds with the pervasive avant-garde philosophies of music, and illustrates how her work troubles even a feminist musicological analysis. Further, through a contemporary critique of Moorman's oeuvre which centralizes the social, cultural, and political implications of her body in performance as integral to the work, this project offers a retrospective visibility to the artist which …
Date:
August 2021
Creator:
Balkcom, Brittney M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Study of Health-Related Screening Behaviors among Individuals in Texas with Adverse Childhood Experiences
Data from this dissertation was obtained from the Texas Behavioral Risk Factor Surveillance System (BRFSS). The Texas BRFSS questionnaire used a cross-sectional retrospective research design while asking questions about individuals' exposure to adverse childhood experiences (ACEs) and included 11 questions. The sample included 9096 individuals over the age of 18 who had exposure to at least one ACE. An ACE score was calculated for all participants and were divided into two groups (less than 4 ACEs and more than 4 ACEs) to compare whether differences in ACE score would impact participating in routine health screening or not. Additionally, whether different kinds of ACEs would impact health screening was also examined. Logistic regression was used to assess whether different kinds of ACEs impact participation in routine health screening. This study found that individuals with a history of childhood adversities including experiencing childhood emotional abuse, living in a dysfunctional household impeded them from participating in routine health screenings. It is recommended that both primary care physicians and mental health providers to use motivational interviewing while interacting with patients with ACE histories. It is also suggested that using trauma-informed care (TIC) in primary care can help patients talk about their abuse histories and …
Date:
August 2021
Creator:
Baniya, Ganesh
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library