Digital Commons Network^™

Development Of An Iridium-Ceramic Substrate Catalyst Bed For The Decomposition Of Ionic Green Liquid Monopropellants, Alejandro Andre Vazquez

Open Access Theses & Dissertations

In an effort to advance green monopropellant propulsion using ionic liquids, the Center for Space Exploration and Technology Research (cSETR) has developed a pellet based catalyst bed for the decomposition of AF-M315E. The present paper will go over some of the fundamental research conducted towards the development of a catalyst bed and some of its applications. Three different catalyst bed designs were produced where each uses a different ceramic substrate material. The three different substrates are aluminum oxide, tungstated zirconia, silicon carbide each coated with iridium as the catalyst material. An experimental setup for testing the catalytic decomposition AF-M315E was …

Towards Analytical Techniques For Systems Engineering Applications, Griselda Valdepeñas Acosta

Open Access Theses & Dissertations

One of the main objectives of systems engineering is to design, maintain, and analyze systems that help the users. To design an appropriate system for an application domain, we need to know: what are the users' desires and preferences (so that we know in what direction we should aim to change this domain), what is the current state and what is the dynamics of this application domain, and how to use all this information to select the best alternatives for the system design and maintenance. Designing a system includes selecting numerical values for many of the parameters describing the corresponding …

Validating A Masculinity Scale In A Non-College Sample, Rubi Gonzales

Open Access Theses & Dissertations

Sexual assault in the United States is prevalent. One out of every six American women has been the victim of an attempted rape or complete rape. Previous research demonstrates that hypermasculine attitudes are positively predictive of sexual aggression toward women. In these studies, researchers have continued to utilize outdated and inappropriate measures like the Hypermasculinity Inventory (1984) to assess hypermasculinity. Measures that assess hypermasculinity have only been validated on college samples. A modern measure of masculinity is the Auburn Differential Masculinity Inventory-23 (Burk, Burkhart, & Sikorski, 2004), which has been validated in college samples. The present research evaluated the psychometric …

In Situ Selective Nitriding Using An Open Source Laser Powder Bed Fusion System, Andres Gerardo Navarro

Open Access Theses & Dissertations

Conventional forms of nitriding titanium limit the locations to surfaces, limiting applications to simple coatings. Additive manufacturing methods provide the opportunity for surface coating methods to be utilized in a layer by layer fabrication method and increase the uses of nitrides. Laser powder bed fusion (LPBF) in particular, provides a fabrication environment with sufficient energy to allow for material nitriding as well as the flexibility of being able to utilize a variety of materials and shielding gases for processing. This project utilizes an AconityONE open source LPBF system with custom laser parameter settings to fabricate and nitride Ti-6Al-4V substrates. This …

Numerical Investigation Of Molten Metal Infiltration And Pillared Cooling Systems At Microscale, Shaikh Tanveer Tanveer Hossain

Open Access Theses & Dissertations

Flow-through porous media at pore-scales is one of the less explored sides of fluid mechanics due to the complexity associated with highly irregular pore geometry. Most of the established methods that try to quantify such flow are based on statistical observations of flow through numerous porous specimens. Such understandings may satisfy the need for applications where micro-level details are not a concern. Some numerical approaches did try to analyze the micro-level flow, but the analysis was confined to small sample sizes due to the intensive computation challenge. There are several applications of porous media flow where analyzing the large-scale flow …

Performance Evaluation Of Communication Technologies And Network Structure For Smart Grid Applications, Desong Bian, Murat Kuzlu, Manisa Pipattanasomporn, Saifur Rahman, Di Shi

Engineering Technology Faculty Publications

The design of an effective and reliable communication network supporting smart grid applications requires the selection of appropriate communication technologies and protocols. The objective of this study is to study and quantify the capabilities of an advanced metring infrastructure (AMI) to support the simultaneous operation of major smart grid functions. These include smart metring, price-induced controls, distribution automation, demand response, and electric vehicle charging/discharging applications in terms of throughput and latency. OPNET is used to simulate the performance of selected communication technologies and protocols. Research findings indicate that smart grid applications can operate simultaneously by piggybacking on an existing AMI …

Exposing Students To Stem Careers Through Hands-On Activities With Drones And Robots, Vukica M. Jovanović, George Mcleod, Thomas E. Alberts, Cynthia Tomovic, Otilia Popescu, Tysha Batts, Ms. Mary Louise Sandy

Engineering Technology Faculty Publications

Autonomous robots have been used in a variety of ways from collecting specimen in hazardous environments to space exploration. These robots can be found in various manufacturing systems as Autonomous Guided Vehicles (AGVs) to transport parts and assemblies throughout the manufacturing system. They have also been used as a vehicle to convey design thinking and other STEM-related concepts in mechanical engineering/mechanical engineering technology, electrical engineering/electrical engineering technology, computer science, and computer engineering. Various outreach events have included robotics based activities that engage students in building and programming autonomous robots for the purpose of achieving a specific task. These events are …

Reliability Estimation Of Reciprocating Seals Based On Multivariate Dependence Analysis And It's Experimental Validation, Chao Zhang, Rentong Chen, Shaoping Wang, Yujie Qian, Mileta M. Tomovic

Engineering Technology Faculty Publications

Accurate reliability estimation for reciprocating seals is of great significance due to their wide use in numerous engineering applications. This work proposes a reliability estimation method for reciprocating seals based on multivariate dependence analysis of different performance indicators. Degradation behavior corresponding to each performance indicator is first described by the Wiener process. Dependence among different performance indicators is then captured using D-vine copula, and a weight-based copula selection method is utilized to determine the optimal bivariate copula for each dependence relationship. A two-stage Bayesian method is used to estimate the parameters in the proposed model. Finally, a reciprocating seal degradation …

Improving Stem Recruitment Through A Theme-Based Summer Residential Camp Focused On Sea Level Rise, Vukica M. Jovanović, Balša Terzić, Mujde Erten-Unal, Victoria Hill, George Mcleod, Michelle Covi, David Burdige, Jenifer Alonzo, Justin Mason, Tysha Batts, Cynthia Tomovic

Engineering Technology Faculty Publications

In this paper, the authors present an enrichment program that focuses on Science, Technology, Engineering, and Math (STEM) concepts. The program is named Building Leaders to Advance Science and Technology (BLAST) and is held each summer at three universities across the Commonwealth of Virginia: Old Dominion University, the University of Virginia, and the Virginia Polytechnic Institute. BLAST is sponsored in partnership among these three universities and the Virginia Space Grant Consortium (VSGC), and is funded by the General Assembly of Commonwealth of Virginia. Its main purpose is to expose high school students to topics related to different STEM fields through …

Work Environment Factors Impacting The Report Of Secondary Trauma In U.S. Resident Assistants, Robert Jason Lynch

Educational Leadership & Workforce Development Faculty Publications

WORKING WITH TRAUMATIZED INDIVIDUALS can have potentially negative impacts on professional support personnel, including cognitive decline, increased anxiety, and declines in physical health. Despite the responsibilities of resident assistants as crisis-responders, few studies explore how they are impacted by secondary trauma. This study sought to understand how specific aspects of the RA work environment relate to their self-reported levels of secondary trauma. Using a sample of RAs (N = 208), the researcher conducted a quantitative secondary analysis of an existing dataset assessing symptoms of secondary traumatic stress in RAs. Findings indicated relationships between a variety of environmental factors and self-reported …

Liberal Education And The Capitalocene In American Higher Education, Laura Smithers

Educational Leadership & Workforce Development Faculty Publications

Data-driven control is remaking American higher education as the Capitalocene is remaking environment around us. In higher education, how might we orientate the queer potential of liberal education to produce the conditions of possibility of an Earth beyond the Capitalocene and data-driven control, an Earth that produces expansive notions of student success and racially just futures? I take up this inquiry in three sections. First, I establish relations between the orientation of the Capitalocene and the apparatus of data-driven control to develop a critical new materialisms analytic. I then diffract the practices of a student success initiative at a west …

Community College Faculty's Attitudes And Self-Efficacy With Literacy Instruction In The Disciplines, Kristen H. Gregory, Linda Bol, Thomas Bean, Tony Perez

Educational Leadership & Workforce Development Faculty Publications

Many community college students are entering college-level courses underprepared for the literacy skills required to be successful. Faculty are considered experts in their disciplines, yet are often not trained in pedagogy and literacy instruction (Furco & Moely, 2012; Moje, 2008; Tsui, 2002). We developed a questionnaire to measure faculty's (n = 231) perceptions of their role, level of self-efficacy, and classroom practice in regard to discipline- specific literacy instruction. We analyzed data using exploratory factor analysis, t-tests, and analysis of variance. The findings show that faculty have marginally positive perceptions and self-efficacy regarding incorporating discipline-specific literacy instruction in their courses. …

Status Of The Western Australian Pastoral Rangelands 2019: Condition, Trend And Risk, Department Of Primary Industries And Regional Development, Western Australia

Natural resources published reports

The Department of Primary Industries and Regional Development (DPIRD) reports annually on the condition, trend and risk of decline in vegetation condition of pastoral rangelands in Western Australia (WA). This report is based on the information available to the end of September 2019.

Vegetation condition reflects the effects of three main drivers: seasonal quality (the timeliness and amount of rainfall), grazing pressure and fire. Reported trend in vegetation condition was based on remotely sensed vegetation cover for the three or four most productive pasture types in each region and greenness (how much vegetation grew) data. Based on these trend data, …

Status Of The Western Australian Pastoral Rangelands 2018: Condition, Trend And Risk, Department Of Primary Industries And Regional Development, Western Australia

Natural resources published reports

The Department of Primary Industries and Regional Development (DPIRD) reports annually on the condition, trend and risk of pastoral rangelands in Western Australia. This report is based on the information available to the end of 2018.

Vegetation condition reflects the effects of three main drivers: seasonal quality (the timeliness and amount of rainfall), grazing pressure and fire. Trend in vegetation condition was based on remotely sensed vegetation cover (Moderate Resolution Imaging Spectroradiometer, MODIS) and greenness (how much vegetation grew) data, the Western Australian Rangeland Monitoring System (WARMS) on-ground site data, and on-ground traverse data. Based on these trend data, in …

Synthesis And Characterization Of Quasi-Two-Dimensional Chromium Sulfides, Furkan Muhammet Altincicek

Theses and Dissertations

Transition metal dichalcogenides (TMDs) are atomically thin semiconductors of the type MX2 with M being a transition metal and X being a chalcogen atom. TMDs have recently attracted considerable attention because of their novel electronic and optical properties. Many TMDs have been studied except CrS2 because of the challenges in its synthesis. However, the most stable form of chromium sulfides, Cr2S3, chromium (III) sulfide, has been known to exhibit novel properties. For this reason, we studied the possibility of synthesizing thin Cr2S3 to mimic CrS2. We synthesized single phase Cr2S3 in vacuum sealed quartz tubes. The synthesis takes about 5 …

Determination Of Maximum Scour Depth For Spur Dikes Based On A Validated Two-Dimensional Hec-Ras Model, Mathew Lee Cox

Theses and Dissertations

The introduction of spur dikes into a river flow field can have many far-reaching positive effects on the stability of a river channel. While the flow velocity directly at the spur dike tip or crest may increase, a large embayment area downstream of the spur dike will form with reduced flow velocities. Due to the increase in flow velocity at the spur dike, a scour hole will form. Scour is the leading cause of failure of hydraulic structures. In the past many hydraulic structures were tested by building scale prototype models, this method is very costly and hard to model …

Thermal Performance Analysis Of The Liquid Cooling And Ventilation Garment (Lcvg) With Respect To Tubing Geometry, Kayla Marie Daniels

Theses and Dissertations

The technology of a liquid-cooled garment allows astronauts to complete extravehicular activities while maintaining a degree of thermal comfort. The garment has gone largely unchanged despite advancements in technology, materials, and knowledge. This research examines possible advancements in thermal efficiency with an alternate tubing geometry through heat transfer rate calculations. A semi-circle cross-section was selected and compared against the current circular cross-section tubing. Each tubing cross-section was 3-D printed and integrated into forearm sleeves. For comparison, the assembly of each sleeve resembled the current Liquid Cooling and Ventilation Garment used with the Extravehicular Mobility Unit. Subjects wore the forearm sleeves …

Writing The Body: Embodied Forms And Animal Spirits, Andrew Harnish

Theses and Dissertations

“Writing the Body: Embodied Forms and Animals Spirits” is comprised of a critical introduction and a novel. The critical introduction, “Embodied Forms: One Writer’s Journey from an Ableist Aesthetic to Disability Consciousness” is a literacy narrative that traces my longstanding internalization of ableist norms and their expression in my fiction, and my gradual embrace of the value of disability as an identity and aesthetic sensibility. In so doing, the introduction argues that dominant notions of “normalcy,” “perfection,” and “beauty” are deeply damaging to the disabled writers who internalize them because they encourage the creation of art that erases disability, both …

Impacts Of Cold Region Hydroclimatic Variability On Phosphorus Exports: Insights From Concentrations - Discharge Relationships, Tyson Lee Jeannotte

Theses and Dissertations

In Devils Lake ND, a terminal lake in the Northern Great Plains, algae blooms are of great concern due to the recent increase of streamflow and subsequent elevated concentrations of nutrients, particularly phosphorus. To date, very few studies explore P concentration to streamflow relationship in cold region agricultural basins, specially the headwater catchments of the Devils Lake basin. This study gains a better understanding of the impacts of hydroclimatic variation on concentration to streamflow relationships between two headwater catchments (Mauvais Coulee: 1032 km2 and Tributary 3: 160 km2) draining to Devils Lake during the 2016-2018 period. This study presents high-resolution …

Enhancing Liquid And Gas Separation With Activated Carbon Mixed-Matrix Membranes, Jeremy Lewis

Theses and Dissertations

Mixed matrix membranes are one class of membrane material that are an especially promising separation media. By adding a particle phase to a matrix phase, multiple mechanistic pathways become available that are not present in pristine organic or inorganic membranes. These pathways can be exploited to better enhance separation performance for a variety of applications.

This research has focused on a specific mixed matrix membrane, which contains bio-derived activated carbon particles in a polysulfone matrix. In proper selection of activating agent, this research has shown that the surface functional groups of the activated carbon are highly influenced. This can lead …

Principals' Perspectives Regarding Grades 9-12 Black, Asian, And Latino Males In North Dakota Public Schools, Maggie Harrison Lowery

Theses and Dissertations

The purpose of this study was to review school policy documents and seek secondary principals’ perspectives regarding Black, Asian, and Latino males grades 9-12 in North Dakota public schools. Qualitative data was collected to investigate practices, policies, and routines that contributes to their graduation rates. Interviews were conducted to four secondary principals within two North Dakota school districts.

For the purpose of this study, participants included secondary principals from selected North Dakota public school districts where Black, Asian, and Latino students have the highest enrollment. School district data include public documents posted on districts’ websites for the term 2017-2018, and …

Examining The Perceptions Of Bullying Between Certified And Non-Certified School Personnel, Shanna Morlock

Theses and Dissertations

Bullying has been a widely researched topic. However, many areas are yet to be researched in regards to school personnels’ perceptions. This dissertation was focused around several of these missing research areas, as well as included non-certified staff. Non-certified staff have been left out of the vast majority of studies involving school personnel and bullying. That, or their perceptions have not been explored as a separate group of school personnel. This is problematic as non-certified staff are often part of supervisory roles in settings where bullying often occurs. This study addressed differences among school personnel perceptions in regards to bullying …

Measuring Friendship Maintenance In Gay Men, Eliah Reding

Theses and Dissertations

This dissertation examines the existing friendship maintenance literature to develop a psychometrically sound scale for the measurement of friendship maintenance among gay men. Existing friendship maintenance research does not adequately capture the uniqueness of gay male friendship. Utilizing DeVellis’s (2016) steps of scale development, this dissertation constructs a new scale, the GayFABS, to assess the unique aspects of friendship maintenance in gay men. Unique in this dissertation is the use of a focus group to establish content validity rather than the traditional approach of expert review. An exploratory factor analysis is conducted to structure the scale and its component subscales. …

Technology And Economy Analysis Of Waste Truck Tires Management, Irina Tsiryapkina

Theses and Dissertations

The main objective of this work was to develop a waste truck tires recycling facility for the Siberian coal transportation company “SibTreid NK” in the Kemerovo region, Russia. For years, the company has been stockpiling old scrap tires at their warehouse or dumping them into open strip mines. Taking this into account as well as existing environmental concerns due to the continually growing coal industry in the Kemerovo region, it is highly necessary to make an operational facility to deal with the large number of accumulated waste truck tires.

To achieve this goal, this project reviewed different methods and technologies …

The Use Of Courts To Protect The Environmental Commons, Lakshman Guruswamy

Publications

No abstract provided.

Talking About Black Lives Matter And #Metoo, Linda S. Greene, Lolita Buckner Inniss, Bridget J. Crawford, Mehrsa Baradaran, Noa Ben-Asher, I. Bennett Capers, Osamudia R. James, Keisha Lindsay

Publications

This essay explores the apparent differences and similarities between the Black Lives Matter and the #MeToo movements. In April 2019, the Wisconsin Journal of Gender, Law and Society hosted a symposium entitled “Race-Ing Justice, En-Gendering Power: Black Lives Matter and the Role of Intersectional Legal Analysis in the Twenty-First Century.” That program facilitated examination of the historical antecedents, cultural contexts, methods, and goals of these linked equality movements. Conversations continued among the symposium participants long after the end of the official program. In this essay, the symposium’s speakers memorialize their robust conversations and also dive more deeply into the phenomena, …

Earthquake Magnitude Prediction Using Support Vector Machine And Convolutional Neural Network, Esther Amfo

Open Access Theses & Dissertations

A deep learning-based method Convolutional Neural Network (CNN) and Support Vector Machine (SVM) for earthquake prediction is proposed. Large-magnitude earthquakes triggered by earthquakes can kill thousands of people and cause millions of dollars worth of economic losses. The accurate prediction of large-magnitude earthquakes is a worldwide problem.

In recent years, deep learning technology that can automatically extract features from mass data has been applied in image recognition, natural language processing, object recognition, etc., with great success. We explore to apply deep learning technology to earthquake prediction, we propose a deep learning method for continuous earthquake prediction using historical seismic events. …

Movement Ecology Of A Cryptic Ambush Predator: Integrating Radio Telemetry And Tri-Axial Accelerometry To Evaluate Spatial Strategies And Activity Patterns By Western Diamond-Backed Rattlesnakes (Crotalus Atrox), Dominic L. Desantis

Open Access Theses & Dissertations

An animal's decision to move from one location to another within its environment is determined by a complex blend of internal and external factors. Teasing apart the relative roles of specific variables in this web of interacting mechanisms has been a long-standing challenge in animal movement ecology. Historically, this problem was viewed as a sort of black box for which a myriad of methodological limitations precluded rigorous study. Recently, a diversity of animal-borne transmitters and dataloggers (i.e., bio-loggers) have circumvented many of these traditional limitations and transformed field studies of animal movement, behavior, and physiology - in some cases, allowing …

Assessment Of Point Of Use (Pou) Systems For Reducing Health Risks Associated With Drinking Water Along The U.S.-Mexico Colonias In The Paso Del Norte Region, Varinia Viridiana Felix Parra

Open Access Theses & Dissertations

In the Paso del Norte Region along the U.S. Mexico Border, there are more than 5,000 families living in impoverished communities known as colonias that lack access to basic infrastructure services such as a public water system. These depend on hauling trucks that deliver water into their storage tanks. Water storage practices by colonia residents on both sides of the border pose an enormous risk for waterborne disease outbreaks and heavy metal contamination because the water quality can decrease rapidly due to volatilization of the residual chlorine, intrusion of rainfall and air-laden dust. Since connection to centralized water treatment and …

Sexual And Relationship Victimization Of Hispanic Sexual Minority Women On A University Campus In A U.S.-Mexico Border City, Mika Gehre

Open Access Theses & Dissertations

Background: Sexual minority women (SMW) are at high risk for health disparities in response to discrimination and stigma. Sexual victimization (SV) in campus settings is a common issue impacting a majority of female students. Rates of sexual victimization and violence within relationships are higher among SMW compared to non-SMW. To date, only a few studies report sexual and family victimization among minority populations in a campus setting. Purpose: The purpose of this study is to describe the rates and relationships between sexual minority status, SV, and abusive relationships among Hispanic women on a University campus in a U.S.-Mexico border city. …