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24,980 Matching Results
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24,961 - 24,980 of
24,980
Remotely Controlled Magneto-Phononic Devices Achieving Nonreciprocity and Anderson Localization in Ferrofluid
Motivated by previous relevant research on phononics including both active and passive phononics, the interest of faster turnability and more functions of the active phononics of further study led to this proposing research topic: magnetic field tunable active functional phononics. The first design of magnetic field tunable reciprocal--non-reciprocal transmission acoustic device was established, material was characterized, and numerical simulation has been performed. The simulation results show clear T-symmetric breaking non-reciprocity due to energy level splitting effect with Doppler effect – an acoustic Zeeman effect. Inspired by this preliminary work, further experiments were planned to demonstrate this effective Zeeman effect in phononics and effectively charged phonons in water based ferro-fluid. The objectives of this work as the next series of tasks were to illustrate acoustic Zeeman effect and acoustic Landau levels in various strength of magnetic field to investigate a design non-reciprocal sound device with magnetic field switching, which could be controlled on the amount of non-reciprocity with the strength of magnetic field. Once this new field first discovered by the proposed study tasks, more active tunable magnetic field phononics devices could be designed and exemplified in terms of both simulations and experiments. Faster and more controllable active phononic devices could …
Date:
December 2021
Creator:
Jin, Yuqi
System:
The UNT Digital Library
Application of Soft X-Ray Appearance Potential Spectroscopy to Light Lanthanides, 4d Transition Metals, and Insulators
Evaporated films of La, Ce, Yb, Y, Ag--Mn(5 percent), KCl, MnF$sub 2$, CsCl and LaF$sub 3$ were studied using the soft x-ray appearance potential spectroscopy (SXAPS) technique. Studies were also made of bulk polycrystalline samples of Y, Zr, Nb, and Mo. The results are discussed in terms of existing SXAPS theories. Several similarities between soft x-ray absorption (SXA) data and the SXAPS results are discussed, and it is shown that the SXA data can aid in the interpretation of SXAPS spectra when using the well-known self-convolution model. In this approximation the absorption coefficient, $alpha$(E), is substituted for the density of states, N(E-E/sub c/) $Yields$ $alpha$(E). For more localized excitations, a convolution of $alpha$(E) with bremsstrahlung isochromat data, based on Wendin's two density of states formalism is used to predict SNAPS results. (auth)
Date:
October 1, 1975
Creator:
Smith, R. J.
System:
The UNT Digital Library
Developing Ultra-Fast Plasmonic Spiking Neuron via Integrated Photonics
This research provides a proof of concept and background theory for the physics behind the state-of-the-art ultra-fast plasmonic spiking neurons (PSN), which can serve as a primary synaptic device for developing a platform for fast neural computing. Such a plasmonic-powered computing system allows localized AI with ultra-fast operation speed. The designed architecture for a plasmonic spiking neuron (PSN) presented in this thesis is a photonic integrated nanodevice consisting of two electro-optic and optoelectronic active components and works based on their coupling. The electro-optic active structure incorporated a periodic array of seeded quantum nanorods sandwiched between two electrodes and positioned at a near-field distance from the topmost metal layer of a sub-wavelength metal-oxide multilayer metamaterial. Three of the metal layers of the metamaterials form the active optoelectronic component. The device operates based on the coupling of the two active components through optical complex modes supported by the multilayer and switching between two of them. Both action and resting potentials occur through subsequent quantum and extraordinary photonics phenomena. These phenomena include the generation of plasmonic high-k complex modes, switching between the modes by enhanced quantum-confined stark effect, decay of the plasmonic excitations in each metal layer into hot-electrons, and collecting hot-electrons by …
Date:
August 2022
Creator:
Goudarzi, Abbas, Sr.
System:
The UNT Digital Library
Reduced Visceral Fat and Biological Indices of Inflammation Following Combined Prebiotic/Probiotic Supplementation in Free Living Adults
Probiotics/prebiotic supplementation represents a viable option for addressing systemic inflammation and chronic disease risk resulting from excessive body weight. The purpose of this feasibility study was to determine if 90-d of supplementation with prebiotic and probiotic could alter mRNA responsible for inflammation and subsequently metabolic health in weight stable overweight adults. Participants were advised to not change their diet or exercise habits during the study. All protocols were approved by the University IRB and participants gave written informed consent. Participants were randomly assigned to either placebo (N=7; rice flour) or combined (N=8) prebiotic (PreticX® Xylooligosaccharide; 0.8 g/d; ADIP) and probiotic (MegaDuo® Bacillus subtilis HU58 and Bacillus coagulans SC-208; 3 Billion CFU/d) and measurements were made at baseline, 30, 60, and 90-d. Whole body DXA scans (GE iDXA®) and blood 574-plex mRNA analysis (Nanostring®) were used to generate primary outcomes. Compared to placebo, supplementation was associated with a 36% reduction in visceral adipose tissue (p = 0.001). Supplement resulted in significant, differential expression of 15 mRNA associated with adipose tissue inflammation, systemic inflammation, and/or chronic disease risk. The key findings support that 90-d prebiotic/probiotic supplementation may be associated with an improved metabolic health, reduced adipose tissue inflammation, reduced systemic inflammation, and …
Date:
December 2021
Creator:
Tanner, Elizabeth A.
System:
The UNT Digital Library
A History of Howard Payne College from 1890 to 1898
Unpublished thesis on the history of Howard Payne College from 1890 to 1898.
Date:
1940
Creator:
Moore, Mary Prince
System:
The Portal to Texas History
A History of Howard Payne College
Unpublished thesis on the history of Howard Payne College and events prior to its establishment.
Date:
1933
Creator:
David, Ben M.
System:
The Portal to Texas History
A History of Howard Payne College
Unpublished thesis on the development and history of Howard Payne College.
Date:
1951
Creator:
Hitt, Bowling M.
System:
The Portal to Texas History
A History of Howard Payne College with Emphasis on the Life and Administration of Thomas H. Taylor
Unpublished dissertation on the history of Howard Payne College and events leading up to its creation, and Thomas H. Taylor.
Date:
1956
Creator:
Hinton, William Harwood
System:
The Portal to Texas History
Noah T. Byars: A Study in Baptist Missionary Effort on the Frontier
Unpublished thesis on the life of Noah T. Byars with focus on his religious contributions as a Baptist. Also, included is a history of the Baptist denomination.
Date:
1941
Creator:
Havins, Thomas Robert
System:
The Portal to Texas History
A Study of the Growth and Influence of Howard Payne College
Unpublished thesis on the history of Howard Payne College and its influence since its creation.
Date:
1949
Creator:
Day, Ida May
System:
The Portal to Texas History
Neurocognitive Effects of Gist Reasoning Training in Student-Athletes with Concussions, ADHD, and Learning Disabilities
Concussions, attention-deficit disorder (ADHD), and learning disabilities can adversely impact learning and academic achievement, particularly with respect to attention, memory, and executive functioning; fortunately, cognitive training can be beneficial and remediating these weaknesses. One such program, strategic memory advanced reasoning training (SMART), utilizes a top-down approach to train individuals in executive, higher-ordered thinking strategies including strategic attention, integration, and innovation to facilitate information synthesis and enhance cognitive efficiency. Thus, the purpose of the study is to examine whether SMART improved performances on various neuropsychological measures tapping into attention, processing speed, memory, and executive functioning for college student-athletes with neurological conditions (e.g., concussions, ADHD, LD). Student-athletes were randomly assigned to the SMART program or a "wait-list" control group and were administered a neuropsychological battery at baseline, immediately following the intervention, and after a four-month delay. Results showed that participants benefited from SMART with respect to working memory immediately following the intervention after controlling for baseline scores. The benefits of working memory also persisted after four months. Additionally, SMART was beneficial for improving attention, but only after four months after the intervention. The findings of the current study were consistent with previous studies which showed positive effects of SMART on working memory …
Date:
August 2017
Creator:
Nguyen, Thomas (Clinical neuropsychologist)
System:
The UNT Digital Library
Relationship between Adolescents' Perceptions of Parental Physical Activity and Their Own Well-Being
The purpose of this study was to examine the relationship between adolescents' perceptions of their parents' encouragement to lose weight and physical activity habits (i.e., exercise habits and sedentary behaviors) and their own physical health-related fitness (HRF) and psychological well-being. Results of structural equation modeling revealed both similarities and differences between boys and girls. Specifically, parental sedentary behavior and encouragement to lose weight related to girls HRF. Among boys, only encouragement to lose weight related to HRF. When inspecting the relationship between HRF and psychological well-being, HRF related to body satisfaction, but not depressive symptoms, among both boys and girls. Results of this study highlight the complex influence that parental perceptions have during adolescent development.
Date:
August 2017
Creator:
Yeatts, Paul E.
System:
The UNT Digital Library
Some Names for Empty Space
Some Names for Empty Space is a collection of poems that considers how poetry and language operate to define human experience, reconciling the 'empty spaces' between the self and the abstracted variables of all things. The poems here often find their impetus in fatherhood and a parent's efforts to explain the world to a child.
Date:
May 2021
Creator:
Koch, Andrew (Poet)
System:
The UNT Digital Library
Cultural Humility, Religion, and Health in Lesbian, Gay, and Bisexual (LGB) Populations
The purpose of this study was to explore the religion – health link in a sample of adults and undergraduate students (N = 555) that identified as lesbian, gay, or bisexual (LGB), and to explore how perceptions of cultural humility of religious individuals and groups toward LGB individuals affect the relationship between religion and health. First, I found religious commitment among LGB individuals was positively correlated with satisfaction in life, but it was negatively correlated with physical health. Second, I found that cultural humility moderated the relationship between religious commitment and satisfaction in life for LGB individuals involved in a religious community. The lowest levels of satisfaction with life were found for individuals with low religious commitment and perceived the cultural humility of their religious community to be low. However, cultural humility did not moderate the relationship between religious commitment and mental and physical health outcomes. Third, I found cultural humility did not moderate the relationship between religious commitment and minority stress (i.e., internalized homophobia). Fourth, I found that cultural humility was a significant positive predictor of motivations to forgive a hurt caused by a religious individual. I conclude by discussing limitations, areas for future research, and implications for counseling.
Date:
August 2017
Creator:
Mosher, David K.
System:
The UNT Digital Library
Development and Analysis of a Mobile Node Tracking Antenna Control System
A wireless communication system allows two parties to exchange information over long distances. The antenna is the component of a wireless communication system that allows information to be converted into electromagnetic radiation that propagates through the air. A system using an antenna with a highly directional beam pattern allows for high power transmission and reception of data. For a directional antenna to serve its purpose, it must be accurately pointed at the object it is communicating with. To communicate with a mobile node, knowledge of the mobile node's position must be gained so the directional antenna can be regularly pointed toward the moving target. The Global Positioning System (GPS) provides an accurate source of three-dimensional position information for the mobile node. This thesis develops an antenna control station that uses GPS information to track a mobile node and point a directional antenna toward the mobile node. Analysis of the subsystems used and integrated system test results are provided to assess the viability of the antenna control station.
Date:
August 2017
Creator:
Hensley, Phillip H.
System:
The UNT Digital Library
The Impact of Commuting on Mental Health
The purpose of this research is to explicate the relationship between commuting behavior, stress, and mental health. The overall results from the regression analysis turned out to be inconclusive given the researcher's initial hypothesis. The commute time reported by respondents did not have a statistically significant bearing on mental health outcomes. This was true for both the normal sample, and the sample that was split by gender.
Date:
August 2017
Creator:
Malek-Ahmadi, John
System:
The UNT Digital Library
African American Soldiers in the Philippine War: An Examination of the Contributions of Buffalo Soldiers during the Spanish American War and Its Aftermath, 1898-1902
During the Philippine War, 1899 – 1902, America attempted to quell an uprising from the Filipino people. Four regular army regiments of black soldiers, the Ninth and Tenth Cavalry, and the Twenty-Fourth and Twenty-Fifth Infantry served in this conflict. Alongside the regular army regiments, two volunteer regiments of black soldiers, the Forty-Eighth and Forty-Ninth, also served. During and after the war these regiments received little attention from the press, public, or even historians. These black regiments served in a variety of duties in the Philippines, primarily these regiments served on the islands of Luzon and Samar. The main role of these regiments focused on garrisoning sections of the Philippines and helping to end the insurrection. To carry out this mission, the regiments undertook a variety of duties including scouting, fighting insurgents and ladrones (bandits), creating local civil governments, and improving infrastructure. The regiments challenged racist notions in America in three ways. They undertook the same duties as white soldiers. They interacted with local "brown" Filipino populations without fraternizing, particularly with women, as whites assumed they would. And, they served effectively at the company and platoon level under black officers. Despite the important contributions of these soldiers, both socially and militarily, …
Date:
August 2017
Creator:
Redgraves, Christopher M.
System:
The UNT Digital Library
Extracting Possessions and Their Attributes
Possession is an asymmetric semantic relation between two entities, where one entity (the possessee) belongs to the other entity (the possessor). Automatically extracting possessions are useful in identifying skills, recommender systems and in natural language understanding. Possessions can be found in different communication modalities including text, images, videos, and audios. In this dissertation, I elaborate on the techniques I used to extract possessions. I begin with extracting possessions at the sentence level including the type and temporal anchors. Then, I extract the duration of possession and co-possessions (if multiple possessors possess the same entity). Next, I extract possessions from an entire Wikipedia article capturing the change of possessors over time. I extract possessions from social media including both text and images. Finally, I also present dense annotations generating possession timelines. I present separate datasets, detailed corpus analysis, and machine learning models for each task described above.
Date:
May 2020
Creator:
Chinnappa, Dhivya Infant
System:
The UNT Digital Library
The Effects of the Use of Natural Language Processing and Task Complexity on Jurors' Assessments of Auditor Negligence
The purpose of my dissertation is to examine jurors' evaluation of auditor negligence in response to auditors' use of natural language processing (NLP). To test my research objective, I conducted a 2x2 between-subjects experiment with 175 jury-eligible individuals. In the online experiment, I manipulated whether the audit team analyzes contracts with NLP software or by having human auditors read the contracts. I also manipulated task complexity as complex or simple. The dependent variables include a binary verdict variable and a scaled assessment of negligence. This dissertation makes several contributions to the accounting literature and practice. First, it contributes to the recent juror literature on emerging technologies by providing evidence that jurors attribute higher negligence assessments to auditors when auditors use NLP to examine contracts than when human auditors examine contracts. I also find that auditors' use of NLP leads to jurors' higher perceived causation, which, in turn, increases jurors' assessments of auditor liability. Second, this study answers the call of other researchers to examine the relationship between task complexity and negligence in different settings. I also find a marginally significant interaction effect of the use of NLP compared to human auditors to perform audit testing that is greater for complex …
Date:
August 2021
Creator:
Cui, Junnan
System:
The UNT Digital Library
A Multi-Site Case Study of Middle School Reading Teachers' Perceptions of the Impact of Response to Intervention
Early reading intervention has not eradicated reading deficiencies at the middle school level. According to the National Center for Educational Statistics (NCES), adolescents continue to read below grade level in middle grades. Response to intervention (RTI) is one method of combating this educational concern. This study examined the impact of implementation of a RTI program within one district across multiple middle school campuses. Using individual structured online questionnaires, focus groups, and document analysis, the researcher employed a qualitative, multi-site case study design to evaluate the perceptions of impact of RTI through the lens of middle school reading teachers. Participants included a convenient purposive sample of middle school reading teachers in a suburban school district of about 24,000 students in North Central Texas. I present a review of relevant research at the middle school level to provide a framework for the current study. Additionally, an outline of methodology, research questions, and the proposed data analysis plan are provided. I discuss the intended use of constant comparative analysis to report findings in themes. Particularly, facilitators, hindrances, and impact are a priori themes for reporting.
Date:
August 2021
Creator:
Norris, Frankie
System:
The UNT Digital Library