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Surface Degradation Behavior of Bulk Metallic Glasses and High Entropy Alloys
In this study, the surface degradation behavior was studied for typical examples from bulk metallic glasses (BMGs), metallic glass composites (MGCs) and high entropy alloys (HEAs) alloy systems that are of scientific and commercial interest. The corrosion and wear behavior of two Zr-based bulk metallic glasses, Zr41.2Cu12.5Ni10Ti13.8Be22.5 and Zr57Cu15.4Ni12.6Al10Nb5, were evaluated in as-cast and thermally relaxed states. Significant improvement in corrosion rate, wear behavior, and friction coefficient was seen for both the alloys after thermal relaxation. Fully amorphous structure was retained with thermal relaxation below the glass transition temperature. This improvement in surface properties was explained by annihilation of free volume, the atomic scale defects in amorphous metals resulting from kinetic freezing. Recently developed MGCs, with in situ crystalline ductile phase, demonstrate a combination of mechanical properties and fracture behavior unseen in known structural metals. The composites showed higher wear rates but lower coefficient of friction compared to monolithic amorphous glasses. No tribolayer formation was seen for the composites in sharp contrast to that of the monolithic metallic glasses. Corrosion was evaluated by open circuit potential (OCP) analysis and potentiodynamic polarization. Site-specific corrosion behavior was studied by scanning vibration electrode technique (SVET) to identify formation of galvanic couples. Scanning kelvin …
Date:
December 2017
Creator:
Ayyagari, Venkata A
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
OPNET Based Design and Performance Evaluation of ZigBee Networks
ZigBee is a substandard of IEEE 802.15 family that is specially designed to take care of factors such as power, data rate and area that primarily affect network performance. This has controlling and monitoring capability, which finds potential applications in different sectors. ZigBee allows the concept of hybrid networks and mobility. A comprehensive analysis of ZigBee networks was carried out by constructing and simulating the networks to evaluate the performance in terms of throughput, delay, network load, and packets dropped. This research is aimed at evaluating the effect of network topology on the system performance. A careful review of simulation platforms brought the conclusion of using OPNET Modeler which has the required frame work. Different network topologies of simple and hybrid were built and simulated. Throughout the simulations, the best-case scenarios were drawn to the conclusion by the graphical analysis of parameters of evaluation. Mobile networks were constructed and simulated to investigate the effect of mobility on communication.
Date:
December 2017
Creator:
Nurubhashu, Mabusubhan Vali
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Psychopathy in Male and Female Offenders: Validating the CAPP-IRS and Investigating the Impact of Gender Role Conformity
Recent conceptualizations of psychopathy are moving toward more inclusive, purely trait-based models. However, researchers continue to heavily rely on assessments of psychopathy that include categorical behavioral elements. The newly developed Comprehensive Assessment of Psychopathic Personality – Institutional Rating Scale appears to be a promising interview-based measure of psychopathy, but research on its reliability and validity is in its infancy. As a second issue, the vast majority of research on psychopathy, particularly in offender populations, is conducted with male participants. Nonetheless, the growing body of literature involving incarcerated females suggests gender differences in the prevalence and manifestation of psychopathic traits. Reasons for these differences are unclear, but some have proposed socialized gender roles as a contributing factor. With a sample of 52 female 49 male offenders recruited from a large, metropolitan jail, this dissertation evaluated the construct validity of the CAPP-IRS and examined the effect of gender role conformity on the manifestation of psychopathic traits. Results indicated that a three-factor model of psychopathy represented by antagonistic interpersonal relations, restricted emotions, and disinhibited behavior best fit the data. Findings further suggested convergent and discriminant validity for the CAPP-IRS. Additionally, masculine and feminine gender role conformity differentially related to psychopathy, but generally accounted …
Date:
December 2017
Creator:
Carter, Rachel Marjann
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Postmodern Multiplicities in Three Original Works
My recent compositions are situated within a postmodern theoretical framework. The heterogeneity of materials and hybridity of musical formation in these works are interpreted and contextualized within a personal reading of postmodern theories. The critical essay traces my aesthetics through a historical investigation into the definition of musical postmodernism. Through extensive citation and analysis of the writings of Julius T. Fraser, Italo Calvino, and Richard Rorty, the essay aims to provide a theoretical context for the interpretation of the musical examples. The creative documentation contains three newly-composed musical works: Piano Trio from Opus 3/c, Opus 6 for Violin, and Opus 7 for Piccolo. The works' postmodern features include creative approaches to the fragmentation of musical time into separate levels, historical allusions, and the exploration of multiplicity.
Date:
December 2017
Creator:
Bejo, Ermir
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Emergent Functionality and Controllability in Beamforming System
This dissertation presents beamforming designs. Using novel techniques and methods, the performance of the beamforming is improved on dual-band, tri-band, flexible function, tunable function in THz, and dynamic controllability on incident wave.
Date:
December 2017
Creator:
Ren, Han
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Facets of Positive Affect and Risk for Bipolar Disorder: Role of the Behavioral Activation System
Bipolar disorder is characterized by disruptions in mood and affect that occur not only during mood episodes, but during euthymic periods as well. At the same time, sensitivity of the behavioral activation system (BAS) has been implicated in the disorder and is a risk marker for it. Less clear is the relationship between BAS sensitivity and positive affect, particularly lower level facets of positive affect. The aim of the present study was to examine the relationship between positive affect and vulnerability for mania as assessed using BAS sensitivity. Specifically, the link between daily levels and fluctuations of positive affect and baseline BAS sensitivity was examined. Following the hierarchical model of affect, this study also assessed the relationship between BAS sensitivity and the distinct facets of positive affect. Finally, this study examined whether BAS sensitivity moderates associations between daily rewards and positive affect. Undergraduates (N = 265) from a large university in the South were recruited to complete measures of BAS sensitivity, affect, and mood symptoms at baseline. Using ecological momentary assessment (EMA), participants completed daily surveys assessing affect and engagement with rewarding situations. An exploratory factory analysis revealed a four factor structure of positive affect, consisting of Serenity, Joviality, Attentiveness, …
Date:
December 2017
Creator:
Dornbach-Bender, Allison
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
P-type Doping of Pulsed Laser Deposited WS2 with Nb
Layered transition metal dichalcogenides (TMDs) are potentially ideal semiconducting materials due to their in-plane carrier transport and tunable bandgaps, which are favorable properties for electrical and optoelectronic applications. However, the ability to make p-n junctions is the foundation of semiconductor devices, and therefore the ability to achieve reproducible p- and n-type doping in TMD semiconducting materials is critical. In this work, p-type substitutional doping of pulsed laser deposited WS2 films with niobium is reported. The synthesis technique of the PLD target with dopant incorporation which also ensures host material stoichiometry is presented. Hall electrical measurements confirmed stable p-type conductivity of the grown films. Structural characterization revealed that there was no segregation phase of niobium in the fabricated films and x-ray phtoelectron spectroscopy (xps) characterization suggest that the p-type doping is due to Nb4+ which results in p-type behavior. Stable hole concentrations as high as 10E21(cm-3) were achieved. The target fabrication and thin film deposition technique reported here can be used for substitutional doping of other 2D materials to obtain stable doping for device applications.
Date:
December 2017
Creator:
Egede, Eforma Justin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Analysis and Performance of a Cyber-Human System and Protocols for Geographically Separated Collaborators
This dissertation provides an innovative mechanism to collaborate two geographically separated people on a physical task and a novel method to measure Complexity Index (CI) and calculate Minimal Complexity Index (MCI) of a collaboration protocol. The protocol is represented as a structure, and the information content of it is measured in bits to understand the complex nature of the protocol. Using the complexity metrics, one can analyze the performance of a collaborative system and a collaboration protocol. Security and privacy of the consumers are vital while seeking remote help; this dissertation also provides a novel authorization framework for dynamic access control of resources on an input-constrained appliance used for completing the physical task. Using the innovative Collaborative Appliance for REmote-help (CARE) and with the support of a remotely located expert, fifty-nine subjects with minimal or no prior mechanical knowledge are able to elevate a car for replacing a tire in an average time of six minutes and 53 seconds and with an average protocol complexity of 171.6 bits. Moreover, thirty subjects with minimal or no prior plumbing knowledge are able to change the cartridge of a faucet in an average time of ten minutes and with an average protocol complexity …
Date:
December 2017
Creator:
Jonnada, Srikanth
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Texas Highways, Volume 64, Number 3, March 2017
Monthly travel magazine discussing locations and events in Texas to encourage travel within the state.
Date:
March 2017
Creator:
Texas. Department of Transportation.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Highways, Volume 64, Number 9, September 2017
Monthly travel magazine discussing locations and events in Texas to encourage travel within the state.
Date:
September 2017
Creator:
Texas. Department of Transportation.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Highways, Volume 64, Number 11, November 2017
Monthly travel magazine discussing locations and events in Texas to encourage travel within the state.
Date:
November 2017
Creator:
Texas. Department of Transportation.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Review of Litigation, Volume 36, Number 2, 2017
Quarterly journal containing articles, notes, and other analyses of litigation and related issues in the United States or internationally.
Date:
2017
Creator:
University of Texas at Austin. School of Law.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Transportation Researcher, Volume 53, Number 4, 2017
Quarterly newsletter of the Texas Transportation Institute discussing the research, professional, and service activities of the organization as well as general research and innovations related to transportation in Texas.
Date:
2017
Creator:
Texas A & M Transportation Institute
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Transportation Researcher, Volume 53, Number 3, 2017
Quarterly newsletter of the Texas Transportation Institute discussing the research, professional, and service activities of the organization as well as general research and innovations related to transportation in Texas.
Date:
2017
Creator:
Texas A & M Transportation Institute
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, December 13, 2017
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
December 13, 2017
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, December 27, 2017
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
December 27, 2017
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, December 20, 2017
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
December 20, 2017
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, December 6, 2017
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
December 6, 2017
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, August 30, 2017
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
August 30, 2017
Creator:
Money, David
Object Type:
Newspaper
System:
The Portal to Texas History
Texas State Parks Official Guide Map
Map of Texas showing the various regions of Texas in different colors, major cities, and the locations of all the Texas state parks. The reverse of the map has advertisements for Texas park services and Toyota.
Date:
May 2017
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Map
System:
The Portal to Texas History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, February 22, 2017
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
February 22, 2017
Creator:
Money, David
Object Type:
Newspaper
System:
The Portal to Texas History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, February 15, 2017
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
February 15, 2017
Creator:
Money, David
Object Type:
Newspaper
System:
The Portal to Texas History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, February 8, 2017
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
February 8, 2017
Creator:
Money, David
Object Type:
Newspaper
System:
The Portal to Texas History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, February 1, 2017
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
February 1, 2017
Creator:
Money, David
Object Type:
Newspaper
System:
The Portal to Texas History