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open access

A Preliminary Controller Design for Drone Carried Directional Communication System

Description: In this thesis, we conduct a preliminary study on the controller design for directional antenna devices carried by drones. The goal of the control system is to ensure the best alignment between two directional antennas so as to enhance the performance of air-to-air communication between the drones. The control system at the current stage relies on the information received from GPS devices. The control system includes two loops: velocity loop and position loop to suppress wind disturbances and to assure the alignment of two directional antennae. The simulation and animation of directional antennae alignment control for two-randomly moving drones was developed using SIMULINK. To facilitate RSSI-based antenna alignment control to be conducted in the future work, a study on initial scanning techniques is also included at the end of this thesis.
Date: August 2015
Creator: AL-Emrani, Firas
Partner: UNT Libraries

My Personal Archive

Description: Presentation for the 2015 International Internet Preservation Consortium General Assembly. This presentation discusses the creation of personal archives in the digital age.
Date: April 27, 2015
Creator: Aasman, Susan
Partner: International Internet Preservation Consortium

Partnership for Building Institutional/National Capacity: Addis Ababa University and University of North Texas Initiatives

Description: Presentation for the 2015 International Conference on Information Communication Technologies (ICT) for Development, Education, and Training. This presentation discusses partnerships for building institutional/national capacity and initiatives at Addis Ababa University and the University of North Texas.
Date: May 2015
Creator: Abate, Solomon Teferra & Alemneh, Daniel Gelaw
Partner: UNT Libraries
open access

How the Source of Audit Committee Accounting Expertise Influences Financial Reporting Timeliness

Description: This practitioner summary article summarizes "The Association between Characteristics of Audit Committee Accounting Experts, Audit Committee Chairs, and Financial Reporting Timeliness,'' which investigates the association between audit committee members’ accounting expertise and financial reporting timeliness.
Date: November 2014
Creator: Abernathy, John L.; Beyer, Brooke; Masli, Adi & Stefaniak, Chad M.
Partner: UNT College of Business
open access

Comments of the Standards Committee of the Auditing Section of the American Accounting Association on the SEC’s Concept Release No. 33-9862; 34-75344 File No. S7-13-15, Possible Revisions to Audit Committee Disclosures

Description: This commentary summarizes the contributors’ views on the various questions asked in the SEC’s Release, Possible Revisions to Audit Committee Disclosures.
Date: September 2015
Creator: Abernathy, John L.; Felix, Robert; Jamal, Karim; Krishnamoorthy, Ganesh & Pevzner, Mikhail
Partner: UNT College of Business
open access

Deduction of physiochemical properties from solubilities: 2,4-dihydroxybenzophenone, biotin, and caprolactam as examples

Description: Article discussing the deduction of physiochemical properties from solubilities and 2,4-dihydroxybenzophenone, biotin, and caprolactam as examples.
Date: April 15, 2015
Creator: Abraham, M. H. (Michael H.); Acree, William E. (William Eugene); Brumfield, Michela; Hart, Erin; Pipersburgh, Lila; Mateja, Katherine et al.
Partner: UNT College of Arts and Sciences
open access

Comment on "Structural Determinants of Drug Partitioning in Surrogates of Phosphatidylcholine Bilayer Strata"

Description: This article gives comment to a previous article published in 'Molecular Pharmaceuticals' titled, "Structural Determinants of Drug Partitioning in Surrogates of Phosphatidylcholine Bilayer Strata."
Date: January 13, 2015
Creator: Acree, William E. (William Eugene); Brumfield, Michela & Abraham, M. H. (Michael H.)
Partner: UNT College of Arts and Sciences
open access

Determining the Emissivity of Roofing Samples: Asphalt, Ceramic and Coated Cedar

Description: The goal is to perform heat measurements examine of selected roofing material samples. Those roofing materials are asphalt shingles, ceramics, and cedar. It’s important to understand the concept of heat transfer, which consists of conduction, convection, and radiation. Research work was reviewed on different infrared devices to see which one would be suitable for conducting my experiment. In this experiment, the main focus was on a specific property of radiation. That property is the emissivity, which is the amount of heat a material is able to radiate compared to a blackbody. An infrared measuring device, such as the infrared camera was used to determine the emissivity of each sample by using a measurement formula consisting of certain equations. These equations account for the emissivity, transmittance of heat through the atmosphere and temperatures of the samples, atmosphere and background. The experiment verifies how reasonable the data is compared to values in the emissivity table. A blackbody method such as electrical black tape was applied to help generate the correct data. With this data obtained, the emissivity was examined to understand what factors and parameters affect this property of the materials. This experiment was conducted using a suitable heat source to heat up the material samples to high temperature. The measurements were taken during the experiment and displayed by the IR camera. The IR images show the behavior of surface temperatures being distributed throughout the different materials. The main challenge was to determine the most accurate emissivity values for all material samples. The results obtained by the IR camera were displayed in figures and tables at different distances, which was between the heap lamp and materials. The materials exhibited different behaviors in temperature and emissivity at certain distances. The emissivity of each material varied with different temperatures. The results led to suggestions …
Date: December 2015
Creator: Adesanya, Oludamilola
Partner: UNT Libraries
open access

Identification and Characterization of an Arabidopsis thaliana Mutant with Tolerance to N-lauroylethanolamine

Description: N-Acylethanolamines (NAEs) are fatty acid derivatives in plants that negatively influence seedling growth. N-Lauroylethanolamine (NAE 12:0), one type of NAE, inhibits root length, increases radial swelling of root tips and reduces root hair numbers in a dose dependent manner in Arabidopis thaliana L. (ecotype Columbia). A forward genetics approach was employed by screening a population of T-DNA “activation-tagged” developed by the Salk Institute lines for NAE resistance to identify potential genes involved in NAE signaling events in Arabidopsis thaliana L. (ecotype Columbia). Seeds of the activation tagged lines were grown at 0, 25, 30, 50, 75 and 100 µM N-lauroylethanolamime (NAE 12:0). Ten plants which displayed NAE tolerance (NRA) seedling phenotypes, compared with wildtype (Columbia, Col-0) seedlings were identified. I focused on one mutant line, identified as NRA 25, where the tolerance to NAE 12:0 appears to be mediated by a single dominant, nuclear gene. Thermal asymmetric interlaced (TAIL) PCR identified the location of the T-DNA insert as 3.86 kbp upstream of the locus At1g68510. Quantitative PCR indicated that the transcript level corresponding to At1g68510 is upregulated approximately 20 fold in the mutant relative to wildtype. To determine whether the NAE tolerance in NRA 25 is associated with overexpression of At1g68510 I created overexpressing lines of At1g68510 with and without GFP fusions behind the 2X35S CaMV promoter. As predicted, results with overexpressing lines of At1g68510 also exhibited enhanced resistance to NAE when compared with the wildtype. Confocal images of the fusion proteins suggest that GFP-At1g68510 is concentrated in the nucleus and this was confirmed by counterstaining with 4', 6-Diamidino-2-phenylindol (DAPI). Futhermore, At1g68510 overexpressing lines and NRA 25 line also exhibited tolerance to abscisic acid (ABA) during seedling germination. The findings suggests that At1g68510 overexpression mediates seedling tolerance to both ABA and NAE, a mechanism independent of fatty acid amide hydrolase …
Date: December 2015
Creator: Adhikari, Bikash
Partner: UNT Libraries
open access

Time Series Data Analysis of Single Subject Experimental Designs Using Bayesian Estimation

Description: This study presents a set of data analysis approaches for single subject designs (SSDs). The primary purpose is to establish a series of statistical models to supplement visual analysis in single subject research using Bayesian estimation. Linear modeling approach has been used to study level and trend changes. I propose an alternate approach that treats the phase change-point between the baseline and intervention conditions as an unknown parameter. Similar to some existing approaches, the models take into account changes in slopes and intercepts in the presence of serial dependency. The Bayesian procedure used to estimate the parameters and analyze the data is described. Researchers use a variety of statistical analysis methods to analyze different single subject research designs. This dissertation presents a series of statistical models to model data from various conditions: the baseline phase, A-B design, A-B-A-B design, multiple baseline design, alternating treatments design, and changing criterion design. The change-point evaluation method can provide additional confirmation of causal effect of the treatment on target behavior. Software codes are provided as supplemental materials in the appendices. The applicability for the analyses is demonstrated using five examples from the SSD literature.
Date: August 2015
Creator: Aerts, Xing Qin
Partner: UNT Libraries
open access

Reformulation of DFT + U as a Pseudohybrid Hubbard Density Funcitonal for Accelerated Materials Discovery

Description: This article introduces ACBN0, a pseudohybrid Hubbard density functional that yields an improved prediction of the band structure of insulators such as transition-metal oxides, with only a negligible increase in computational cost.
Date: January 28, 2015
Creator: Agapito, Luis A.; Curtarolo, Stefano & Buongiorno Nardelli, Marco
Partner: UNT College of Arts and Sciences
open access

“No Paper Cowboys”: Stories

Description: Equilibrium is paramount in the crafting of a story, and for every writer this sense of balance is different. The writer must manage a balance of showing and telling, of denotation and connotation, and forever strive to find the perfect word in both the denotative and connotative sense, so that the reader and writer can meeting in a living story—both in the ink on the page and the remaining white space.
Date: December 2015
Creator: Agnew, Bryn
Partner: UNT Libraries
open access

Determinants of Effort and Associated Cardiovascular Response to a Behavioral Restraint Challenge

Description: This study directly tested implications of motivation intensity theory on effort to restrain against a behavioral urge or impulse (i.e. restraint intensity). Two factors were manipulated—magnitude of an urge and the importance of successfully resisting it—with cardiovascular (CV) responses related to active coping measured. Male and female undergraduate students were presented with a mildly- or strongly evocative film clip with instructions to refrain from showing any facial response. Success was made more or less important through coordinated manipulations of outcome expectancy, ego-involvement, and performance assessment. As expected, systolic blood pressure responses assessed during the performance period were proportional to the evocativeness of the clip when importance was high, but low regardless of evocativeness when importance was low. These findings support a new conceptual analysis concerned with the determinants and CV correlates of restraint intensity. Implications of the study and associations with current self-regulatory literature are discussed.
Date: December 2015
Creator: Agtarap, Stephanie
Partner: UNT Libraries
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