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An Accelerometer-based Gesture Recognition System for a Tactical Communications Application (open access)

An Accelerometer-based Gesture Recognition System for a Tactical Communications Application

In modern society, computers are primarily interacted with via keyboards, touch screens, voice recognition, video analysis, and many others. For certain applications, these methods may be the most efficient interface. However, there are applications that we can conceive where a more natural interface could be convenient and connect humans and computers in a more intuitive and natural way. These applications are gesture recognition systems and range from the interpretation of sign language by a computer to virtual reality control. This Thesis proposes a gesture recognition system that primarily uses accelerometers to capture gestures from a tactical communications application. A segmentation algorithm is developed based on the accelerometer energy to segment these gestures from an input sequence. Using signal processing and machine learning techniques, the segments are reduced to mathematical features and classified with support vector machines. Experimental results show that the system achieves an overall gesture recognition accuracy of 98.9%. Additional methods, such as non-gesture recognition/suppression, are also proposed and tested.
Date: December 2015
Creator: Tidwell, Robert S., Jr.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Act Like a Punk, Sing Like a Feminist: A Longitudinal Content Analysis of Feminist Themes in Punk Rock Song Lyrics, 1970-2009 (open access)

Act Like a Punk, Sing Like a Feminist: A Longitudinal Content Analysis of Feminist Themes in Punk Rock Song Lyrics, 1970-2009

Punk rock music has long been labeled sexist as copious media-generated accounts and reports of the genre concentrate on male artists, hyper-masculine performances, and lyrics considered to be aggressive, sexist, and misogynist. However, scholars have rarely examined punk rock music longitudinally, focusing heavily on 1980s and 1990s manifestations of the genre. Furthermore, few systematic content analyses of feminist themes in punk rock song lyrics have been conducted. The present research is a longitudinal content analysis of lyrics of 600 punk rock songs released for four decades between 1970 and 2009 to examine the prevalence of and longitudinal shifts in antiestablishment themes, the prevalence of and longitudinal shifts in sexist themes relative to feminist themes, the prevalence of and longitudinal shifts in specific feminist branches, and what factors are related to feminism. Using top-rated albums retrieved from Sputnik Music’s “Best Punk Albums” charts, systematic random sampling was applied to select 50 songs for each combination of three gender types and four decades. Sexism and feminism were then operationalized to construct a coding sheet to examine relevant dimensions. While the present study found no significant patterns of longitudinal increase or decrease in feminist or sexist themes, it revealed that feminist themes were …
Date: May 2015
Creator: Levine, Lauren E.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Adult Attachment, Acculturation, and Help-seeking Attitudes of Latino College Students (open access)

Adult Attachment, Acculturation, and Help-seeking Attitudes of Latino College Students

Based on theoretical reasoning and empirical evidence, the present study examined the unique and shared effects of attachment anxiety, attachment avoidance, and acculturation on attitudes toward seeking professional help among Latino college students. The research participants included 149 bilingual Latino college students from a large, public southwestern university. Results of a multiple regression analysis indicated that attachment avoidance was positively associated with both the recognition of need for psychological help and stigma of seeking professional help. Acculturation to American society was found to be statistically insignificant in predicting help-seeking attitudes in this sample of the population. Findings from exploratory questions suggested that Latino individuals would most likely seek help from parents, close friends, and then professionals. This study suggested that Latino individuals with high attachment avoidance acknowledge the potential benefit of professional help-seeking but distrust the process of approaching others for help. Limitations, implications, and future research directions will be discussed.
Date: May 2015
Creator: Zamudio, Gabriel
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Airbourne WiFi Networks Through Directional Antenna: An Experimental Study (open access)

Airbourne WiFi Networks Through Directional Antenna: An Experimental Study

In situations where information infrastructure is destroyed or not available, on-demand information infrastructure is pivotal for the success of rescue missions. In this paper, a drone-carried on demand information infrastructure for long-distance WiFi transmission system is developed. It can be used in the areas including emergency response, public event, and battlefield. The WiFi network can be connected to the Internet to extend WiFi access to areas where WiFi and other Internet infrastructures are not available. In order to establish a local area network to propagate WIFI service, directional antennas and wireless routers are used to create it. Due to unstable working condition on the flying drones, a precise heading turning stage is designed to maintain the two directional antennas facing to each other. Even if external interferences change the heading of the drones, the stages will automatically rotate back to where it should be to offset the bias. Also, to maintain the same flying altitude, a ground controller is designed to measure the height of the drones so that the directional antennas can communicate to each other successfully. To verify the design of the whole system, quite a few field experiments were performed. Experiments results indicates the design is reliable, …
Date: May 2015
Creator: Gu, Yixin
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Algorithm Optimizations in Genomic Analysis Using Entropic Dissection (open access)

Algorithm Optimizations in Genomic Analysis Using Entropic Dissection

In recent years, the collection of genomic data has skyrocketed and databases of genomic data are growing at a faster rate than ever before. Although many computational methods have been developed to interpret these data, they tend to struggle to process the ever increasing file sizes that are being produced and fail to take advantage of the advances in multi-core processors by using parallel processing. In some instances, loss of accuracy has been a necessary trade off to allow faster computation of the data. This thesis discusses one such algorithm that has been developed and how changes were made to allow larger input file sizes and reduce the time required to achieve a result without sacrificing accuracy. An information entropy based algorithm was used as a basis to demonstrate these techniques. The algorithm dissects the distinctive patterns underlying genomic data efficiently requiring no a priori knowledge, and thus is applicable in a variety of biological research applications. This research describes how parallel processing and object-oriented programming techniques were used to process larger files in less time and achieve a more accurate result from the algorithm. Through object oriented techniques, the maximum allowable input file size was significantly increased from 200 …
Date: August 2015
Creator: Danks, Jacob R.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Amarillo Globe-News: How Did Gene Howe and the Globe-News Help Guide Amarillo, Texas through the Dust Bowl and Great Depression? (open access)

Amarillo Globe-News: How Did Gene Howe and the Globe-News Help Guide Amarillo, Texas through the Dust Bowl and Great Depression?

For many years newspapers were locally owned by editors and publishers. However, today many are run by corporations from out of state. As a result, many communities have lost the personal relationship between the family owned publication and the community. Gene Howe, who served as editor, publisher and columnist of the Amarillo Globe-News from 1926 until his death in 1952, believed the community was where the focus should be and the newspaper should do all that it can to help their readers. Despite the fact that Howe was not born in Amarillo, Texas, his passion and love for the city and its inhabitants compensated for it. During the Dust Bowl and Great Depression Howe and the Globe-News helped Amarillo survive the dust and economic storms that blew through the Texas Panhandle, an area that has not been written as much as other parts of Texas. Through his “Tactless Texan” column, which served as a pulpit to the community, to the various contests and promotions the newspaper sprang up, including the creation of Mother in Law Day, Gene Howe gave the newspaper another dimension little has been studied about, the role of the editor and publisher in guiding a community through …
Date: May 2015
Creator: Hasman, Gregory R. C.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
An Analysis of Du cristal…à la fumée by Kaija Saariaho and Axiom Unearthed, Original Composition (open access)

An Analysis of Du cristal…à la fumée by Kaija Saariaho and Axiom Unearthed, Original Composition

Beginning in the 1970s, and aided by the advancement and an increased prevalence of computers, spectral music emerged as an important development in twentieth century music. Spectral composers, as exemplified by Gérard Grisey and Tristan Murail, took the harmonic spectra of sounds as the fundamental materials of composition. The resulting music placed an emphasis on texture and gradually evolving forms. The generation of composers immediately following the spectralists assimilated their techniques into distinct and varying styles. Finnish composer Kaija Saariaho uses spectral techniques to create an aesthetic that generates form and progression from a sound/noise axis. In her piece Du cristal…à la fumée, a number of pendulum and half-pendulum gestures build up texture and form. The accompanying original composition Axiom Unearthed employs similar pendulum gestures and uses spectral techniques to generate melody and harmony in an aesthetic divergent from traditional spectral pieces.
Date: May 2015
Creator: Allen, John Clay
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Anger, Forgiveness and Mindfulness: Correlates of Perceived Stress in an LGB Sample (open access)

Anger, Forgiveness and Mindfulness: Correlates of Perceived Stress in an LGB Sample

A sexual minority is someone who identifies as lesbian, gay or bisexual (LGB). According to the Minority Stress Model (Meyer, 2003), sexual minorities encounter significant levels of stress due to their minority group status, thus they are more likely to experience perceived stress. Our cross-sectional, correlational study aimed to explore the relationships between forgiveness, mindfulness and anger and how they are related to perceived stress in a convenience sample of ethnically diverse LGB adults. We hypothesized that: 1) anger is positively associated with perceived stress; 2) forgiveness is negatively associated with perceived stress; 3) mindfulness is negatively associated with perceived stress; and 4) anger, forgiveness and mindfulness account for a significant proportion of the variance in perceived stress. 5) The relationship between anger and perceived stress is moderated by forgiveness. 6) The relationship between anger and perceived stress is moderated by mindfulness. Among LGB adults, the extant literature does not address these four variables in conjunction and the relationships between anger, forgiveness, mindfulness and stress has yet to be explored. Various statistical analyses were conducted, including a hierarchical linear regression to test our model. We found that our overall model accounted for 36% of the total variance in perceived stress …
Date: December 2015
Creator: Schumacher, Matthew Robert
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Anisotropic Nature of Radially Strained Metal Tubes (open access)

Anisotropic Nature of Radially Strained Metal Tubes

Metal pipes are sometimes swaged by a metal cone to enlarge them, which increases the strain in the material. The amount of strain is important because it affects the burst and collapse strength. Burst strength is the amount of internal pressure that a pipe can withstand before failure, while collapse strength is the amount of external pressure that a pipe can withstand before failure. If the burst or collapse strengths are exceeded, the pipe may fracture, causing critical failure. Such an event could cost the owners and their customers millions of dollars in clean up, repair, and lost time, in addition to the potential environmental damage. Therefore, a reliable way of estimating the burst and collapse strength of strained pipe is desired and valuable. The sponsor currently rates strained pipes using the properties of raw steel, because those properties are easily measured (for example, yield strength). In the past, the engineers assumed that the metal would be work-hardened when swaged, so that yield strength would increase. However, swaging introduces anisotropic strain, which may decrease the yield strength. This study measured the yield strength of strained material in the transverse and axial direction and compared them to raw material, to determine …
Date: December 2015
Creator: Strickland, Julie N.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Application of Cyclic Polarization of Aluminum 3003 Used in All-Aluminum Microchannel Heat Exchangers (open access)

Application of Cyclic Polarization of Aluminum 3003 Used in All-Aluminum Microchannel Heat Exchangers

All-aluminum microchannel heat exchangers are designed to significantly reduce refrigerant charge requirements, weight, reduced brazed joints, and decreased potential for leakage by increasing reliability. Al 3003 alloy is corrosion resistant and can be formed, welded, and brazed but the issue with all-aluminum heat exchangers is localized corrosion (pitting) in corrosive environments. Currently, there is no universally accepted corrosion test that all coil manufacturers use to characterize their products. Electrochemical testing method of cyclic polarization was employed in this investigation and relevant parameters including electrolyte corrosive agent and its concentration, electrolyte pH, and applied potential scan rate was varied to find an optimal set of parameters. Results of cyclic polarization of Al 3003 in electrolytes containing various concentrations of NaCl were compared with those of the tests in Sea Water Acidified Accelerated Test (SWAAT) electrolyte and it is shown the SWAAT electrolyte (4.2% sea salt acidified to pH of 2.9) is by far stronger (in terms of corrosivity) than typical 3.5% NaCl solution used in most corrosion testing. Corrosion rates (g/m2yr) of Al 3003 measured in this investigation were comparable to those provided by ISO 9223 standard corresponding to C1 through CX categories. Duration of cyclic polarization test is much shorter …
Date: May 2015
Creator: Barnes, Javier
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Applications of Single Reference Methods to Multi-Reference Problems (open access)

Applications of Single Reference Methods to Multi-Reference Problems

Density functional theory is an efficient and useful method of solving single-reference computational chemistry problems, however it struggles with multi-reference systems. Modifications have been developed in order to improve the capabilities of density functional theory. In this work, density functional theory has been successfully applied to solve multi-reference systems with large amounts of non-dynamical correlation by use of modifications. It has also been successfully applied for geometry optimizations for lanthanide trifluorides.
Date: May 2015
Creator: Jeffrey, Chris C.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Archaeological Site Vulnerability Modeling for Cultural Resources Management Based on Historic Aerial Photogrammetry and LiDAR (open access)

Archaeological Site Vulnerability Modeling for Cultural Resources Management Based on Historic Aerial Photogrammetry and LiDAR

GIS has been utilized in cultural resources management for decades, yet its application has been largely isolated to predicting the occurrence of archaeological sites. Federal and State agencies are required to protect archaeological sites that are discovered on their lands, but their resources and personnel are very limited. A new methodology is evaluated that uses modern light detection and ranging (LiDAR) and historic aerial photogrammetry to create digital terrain models (DTMs) capable of identifying sites that are most at risk of damage from changes in terrain. Results revealed that photogrammetric modeling of historic aerial imagery, with limitations, can be a useful decision making tool for cultural resources managers to prioritize conservation and monitoring efforts. An attempt to identify key environmental factors that would be indicative of future topographic changes did not reveal conclusive results. However, the methodology proposed has the potential to add an affordable temporal dimension to future digital terrain modeling and land management. Furthermore, the methods have global applicability because they can be utilized in any region with an arid environment.
Date: August 2015
Creator: Helton, Erin King
Object Type: Thesis or Dissertation
System: The UNT Digital Library
An Arduino Based Control System for a Brackish Water Desalination Plant (open access)

An Arduino Based Control System for a Brackish Water Desalination Plant

Water scarcity for agriculture is one of the most important challenges to improve food security worldwide. In this thesis we study the potential to develop a low-cost controller for a small scale brackish desalination plant that consists of proven water treatment technologies, reverse osmosis, cation exchange, and nanofiltration to treat groundwater into two final products: drinking water and irrigation water. The plant is powered by a combination of wind and solar power systems. The low-cost controller uses Arduino Mega, and Arduino DUE, which consist of ATmega2560 and Atmel SAM3X8E ARM Cortex-M3 CPU microcontrollers. These are widely used systems characterized for good performance and low cost. However, Arduino also requires drivers and interfaces to allow the control and monitoring of sensors and actuators. The thesis explains the process, as well as the hardware and software implemented.
Date: August 2015
Creator: Caraballo, Ginna
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Assessment of Hot and Cool Executive Functioning Following Trauma Using the Traditional Stroop Task, Emotional Stroop Task, and a Novel Implicit Association Test (open access)

Assessment of Hot and Cool Executive Functioning Following Trauma Using the Traditional Stroop Task, Emotional Stroop Task, and a Novel Implicit Association Test

Individuals who have experienced a traumatic event and develop Post-Traumatic Stress Disorder (PTSD) frequently show deficits in both primarily “cool” and “hot” cognitive executive functions (e.g., traditional & emotional Stroop tasks, respectively) that can be impacted by high affective salience. Given the dimensional nature of psychopathology, questions remain about individuals within the general population who have experienced trauma but do not meet full criteria for PTSD and yet may manifest problems in these areas, especially areas of hot and cool executive functioning (EF). Thus, the current project was designed to assess hot and cool EF in a relatively large sample of individuals from the general population who have experienced trauma and currently demonstrate sub-clinical levels of post-traumatic symptoms. The Stroop task, Emotional Stroop task, and a novel modified Implicit Association Test were utilized to assess EF across a spectrum of individuals with varying traumatic histories and level of post-traumatic symptoms. Results suggest that a greater frequency of trauma experiences was moderately associated with worse performance on both hot and cool executive functioning measures. Specifically, females within the sample evidenced a close relationship between traumatic experiences, post-trauma symptoms, and executive functioning. Clinical and theoretical implications are discussed.
Date: December 2015
Creator: Sullivan, Erin
Object Type: Thesis or Dissertation
System: The UNT Digital Library
An Assessment of Uncommon Titanium Binary Systems: Ti-Zn, Ti-Cu, and  Ti-Sb (open access)

An Assessment of Uncommon Titanium Binary Systems: Ti-Zn, Ti-Cu, and Ti-Sb

The current study focuses on phase stability and evolution in the titanium-zinc titanium-copper and titanium-antimony systems. The study utilized the Laser Engineering Net Shaping (LENS™) processing technique to deposit compositionally graded samples of three binary system in order to allow the assessment of phase stability and evolution as a function of composition and temperature the material is subjected to. Through LENS™ processing it was possible to create graded samples from Ti-xSb (up to 13wt%) and Ti-xCu (up to 16wt%). The LENS™ deposited gradient were solutionized, and step quenched to specific aging temperature, and the resulting microstructures and phase were characterized utilizing XRD, EDS, SEM, FIB and TEM. The Ti-Zn system proved incapable of being LENS™ deposited due to the low vaporization temperature of Zn; however, a novel processing approach was developed to drip liquid Zn onto Ti powder at temperatures above β transus temperature of Ti (882 ◦C) and below the vaporization temperature of Zn (907 ◦C). The product of this processing technique was characterized in a similar way as the graded LENS™ depositions. From measurements performed on Ti-Sb it seems that Sb could be a potential α stabilizer in Ti due to the presence of a mostly homogeneous α …
Date: May 2015
Creator: Brice, David
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Associations Between Physical Fitness and Academic Achievement: A Meditational Analysis (open access)

Associations Between Physical Fitness and Academic Achievement: A Meditational Analysis

Research has illustrated the interrelatedness of childhood physical fitness and psychological wellbeing, psychological wellbeing and academic achievement, as well as physical fitness and academic achievement. In this study, we proposed that psychological wellbeing (self-esteem and depression) serves as a mediator between physical fitness and academic achievement during adolescence. In a sample of middle school children (N = 1,530), significant correlations were found between all three variables (p.0001). A hierarchical regression analysis was performed to assess the associations between physical fitness, psychological wellbeing, and academic achievement. The regression analysis reported a significant partial mediation effect. The results of this study supported the proposed hypotheses, including a mechanism of psychological wellbeing partially mediating the relationship between physical fitness and academic achievement. The findings of this study support the importance of encouraging activities to promote both physical fitness and psychological wellbeing in schools.
Date: May 2015
Creator: Dorfman, Jocelyn C.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Automatic Removal of Complex Shadows From Indoor Videos (open access)

Automatic Removal of Complex Shadows From Indoor Videos

Shadows in indoor scenarios are usually characterized with multiple light sources that produce complex shadow patterns of a single object. Without removing shadow, the foreground object tends to be erroneously segmented. The inconsistent hue and intensity of shadows make automatic removal a challenging task. In this thesis, a dynamic thresholding and transfer learning-based method for removing shadows is proposed. The method suppresses light shadows with a dynamically computed threshold and removes dark shadows using an online learning strategy that is built upon a base classifier trained with manually annotated examples and refined with the automatically identified examples in the new videos. Experimental results demonstrate that despite variation of lighting conditions in videos our proposed method is able to adapt to the videos and remove shadows effectively. The sensitivity of shadow detection changes slightly with different confidence levels used in example selection for classifier retraining and high confidence level usually yields better performance with less retraining iterations.
Date: August 2015
Creator: Mohapatra, Deepankar
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Best Medicine (open access)

The Best Medicine

The Best Medicine is an animated documentary that explores the true stories behind the live performances of stand-up comedians. The film juxtaposes live stand-up performances with candid interview footage combined with animation and illustration. Three subjects– Michael Burd, Casey Stoddard, and Jacob Kubon– discuss alcoholism, childhood abuse, and sexual anxiety, respectively. Their candid, intimate interviews reveal personal information, creating a new context with which to understand live stand-up comedy performance. This illustrates themes of finding humor in dark or painful circumstances and the cathartic nature writing and performance.
Date: May 2015
Creator: Lechler, Ron
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Burner Project: Privacy and Social Control in a Networked World (open access)

The Burner Project: Privacy and Social Control in a Networked World

As mobile phones become increasingly ubiquitous in today’s world, academic and public audiences alike are curious about the interaction between mobile technologies and social norms. To investigate this phenomenon, I examined how individuals use technology to actively manage their communication behaviors. Through a three-month research project on usage patterns of Burner, a mobile application, this thesis explores the relationships among technology, culture, and privacy. Burner is a service that equips individuals with the means to create, maintain, and/or dissolve social ties by providing temporary, disposable numbers to customers. The application offers a way to communicate without relying on a user’s personal phone number. In other words, Burner acts as a “privacy layer” for mobile phones. It also provides a valuable platform to examine how customers use the application as a strategy for communication management. This thesis represents a marriage of practice and theory: (1) As an applied enterprise, the project was constructed as a customer needs assessment intending to examine how the service was situated in the lives of its users. The findings have successfully been applied to my client’s company strategy and have led to a more informed customer approach. (2) As an academic endeavor, this research contributes to …
Date: May 2015
Creator: Shade, Molly
Object Type: Thesis or Dissertation
System: The UNT Digital Library
La Búsqueda de la Identidad Femenina en las Novelas de Dos Autoras Mexicanas (open access)

La Búsqueda de la Identidad Femenina en las Novelas de Dos Autoras Mexicanas

The novel is one means by which writers can provide examples of the possibilities for women in patriarchal societies to seek greater independence. Sabina Berman (1955- ) and Silvia Molina (1946- ) are modern day Mexican novelists whose writings support the betterment of the female condition in this Latin American society. This study focuses on these two authors and describes and analyzes several of their female protagonists who can be characterized as being in search of their self-identity and self-realization. The novels of interest are La Bobe (2006) and La Mujer que Buceó Dentro del Corazón del Mundo (2010) by Sabina Berman and La Mañana Debe Seguir Gris (1977) and El Amor Que Me Juraste (1998) by Silvia Molina. The theoretical framework used to analyze these novels is based on The Second Sex by Simone de Beauvoir and on the writings of the Mexican author Rosario Castellanos. These novels provide examples of how women can challenge patriarchal social norms in order to seek their identity as an individual and their self-realization. However, to do this, women must be willing to accept the risks and costs that may accompany this self-searching. By seeking identity women can satisfy their longings and desires, …
Date: May 2015
Creator: Shrefler, Carmen Lara
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Captain of the People in Renaissance Florence (open access)

The Captain of the People in Renaissance Florence

The Renaissance Florentine Captain of the People began as a court, which defended the common people or popolo from the magnates and tried crimes such as assault, murder and fraud. This study reveals how factionalism, economic stress and the rise of citizen magistrate courts eroded the jurisdiction and ended the Court of the Captain. The creation of the Captain in 1250 occurred during the external fight for dominance between the Holy Roman Emperor and the Pope and the struggle between the Guelfs and Ghibellines within the city of Florence. The rise of the Ciompi in 1379, worried the Florentine aristocracy who believed the Ciompi was a threat to their power and they created the Otto di Guardia, a citizen magistrate court. This court began as a way to manage gaps in jurisdiction not covered by the Captain and his fellow rectors. However, by 1433 the Otto eroded the power of the Captain and his fellow rectors. Historians have argued that the Roman law jurists in this period became the tool for the aristocracy but in fact, the citizen magistrate courts acted as a source of power for the aristocracy. In the 1430s, the Albizzi and Medici fought for power. The …
Date: August 2015
Creator: Hamilton, Desirae
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Characterization of Ti-6Al-4V Produced Via Electron Beam Additive Manufacturing (open access)

Characterization of Ti-6Al-4V Produced Via Electron Beam Additive Manufacturing

In recent years, additive manufacturing (AM) has become an increasingly promising method used for the production of structural metallic components. There are a number of reasons why AM methods are attractive, including the ability to produce complex geometries into a near-net shape and the rapid transition from design to production. Ti-6Al-4V is a titanium alloy frequently used in the aerospace industry which is receiving considerable attention as a good candidate for processing via electron beam additive manufacturing (EBAM). The Sciaky EBAM method combines a high-powered electron beam, weld-wire feedstock, and a large build chamber, enabling the production of large structural components. In order to gain wide acceptance of EBAM of Ti-6Al-4V as a viable manufacturing method, it is important to understand broadly the microstructural features that are present in large-scale depositions, including specifically: the morphology, distribution and texture of the phases present. To achieve such an understanding, stereological methods were used to populate a database quantifying key microstructural features in Ti-6Al-4V including volume fraction of phases, a lath width, colony scale factor, and volume fraction of basket weave type microstructure. Microstructural features unique to AM, such as elongated grains and banded structures, were also characterized. Hardness and tensile testing were …
Date: December 2015
Creator: Hayes, Brian J.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Classifying Pairwise Object Interactions: A Trajectory Analytics Approach (open access)

Classifying Pairwise Object Interactions: A Trajectory Analytics Approach

We have a huge amount of video data from extensively available surveillance cameras and increasingly growing technology to record the motion of a moving object in the form of trajectory data. With proliferation of location-enabled devices and ongoing growth in smartphone penetration as well as advancements in exploiting image processing techniques, tracking moving objects is more flawlessly achievable. In this work, we explore some domain-independent qualitative and quantitative features in raw trajectory (spatio-temporal) data in videos captured by a fixed single wide-angle view camera sensor in outdoor areas. We study the efficacy of those features in classifying four basic high level actions by employing two supervised learning algorithms and show how each of the features affect the learning algorithms’ overall accuracy as a single factor or confounded with others.
Date: May 2015
Creator: Janmohammadi, Siamak
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Community Development at Heronswood Botanical Garden (open access)

Community Development at Heronswood Botanical Garden

The overall main goal of this research is to assist with the planning and creation of an ethnobotanical addition at the Heronswood Garden, a botanical garden located in northwest Washington state recently purchased by the Port Gamble S’Klallam Tribe. Methods included a three month long ethnographic study of Heronswood Garden as an official intern, and conducting a needs assessment that primarily employed participant observation and semi-structured open-ended interviews with all garden employees. Information revealed through the research includes causal issues behind a lack of community participation at the garden, elaboration on the solutions to various issues facilitated by negotiating and combining the views and opinions of the garden’s employees, and author reflections on the needs assessment report and the project as a whole. This research connects itself with and utilizes the methodologies and theories from applied anthropology, environmental anthropology, and environmental science to provide contemporary perspective into the subject of preserving or preventing the loss of biodiversity, language diversity, and sociocultural diversity.
Date: May 2015
Creator: Cherry, Levi Scott
Object Type: Thesis or Dissertation
System: The UNT Digital Library