Digital Commons Network^™

Modulation Of Non-Diffracting Hermite Gaussian Beams And Nonlinear Optical Microscopy For Nanoscale Sulfur Imaging, Gilberto Navarro

Open Access Theses & Dissertations

Hermite Gaussian beams are the solutions of the scalar paraxial wave equation in Cartesian coordinates. A method was developed to modulate the intensity profile of non-diffracting Hermite Gaussian (HG) beams. The original HG beamâ??s intensity profile consists of high intense corner lobes and low intense central lobes which is not ideal for structured illumination in light-field microscopy. The modulated HG beams were generated by multiplying the original HGâ??s beam envelope by a super-Gaussian envelope to modify the intensity profile to attain equal intensity lobes. The propagation of the original HG beam and modulated HG beam were compared to determine that …

Predictive Utility Of The El Paso Pretrial Risk Assessment Instrument - Revised (Eppra-R), Chelsea Sierra Queen

Open Access Theses & Dissertations

Pretrial risk assessments are used to divert defendants from pretrial detention by estimating risk of pretrial specific outcomes (i.e., failure to appear, rearrest). Ongoing validation of this tool is recommended to assess accuracy and ensure that there is no bias against specific subgroups (e.g., gender, race/ethnicity, or age) of defendants. The present study evaluates the utility of a locally developed instrument in El Paso County - a predominantly Latinx county. Area Under the Curve (AUC) Receiving Operator Condition (ROC) analyses indicate statistically â??fairâ?? predictive utility for the tool. Binary logistic regression models suggest no evidence of bias. This study will …

Fabrication, Microstructure And Mechanical Characterization Of Crvnbtaw High Entropy Alloy Coatings Using Magnetron Sputtering, Jorge Quezada

Open Access Theses & Dissertations

In this project a CrVNbTaW high entropy alloy was evaluated. The samples were made using radio frequency magnetron sputtering and were made under similar conditions. The deposition parameters were explored to find the ideal deposition process. The process included a pressure from 0.1-2mTorr, 600C, 1 hour duration, at 100W power to guns, and constant argon flow. The samples were fabricated under similar parameters using silicon steel and sapphire substrates. The samples were analyzed and characterized using X-ray diffraction, scanning electron microscopy, atomic force microscopy, nanoindentation and corrosion testing. Based on these results we were able to get a better understanding …

Metrological Challenges Of Practical Computer-Enhanced Measurements, Hector Alejandro Reyes

Open Access Theses & Dissertations

As technology progresses, sensors and computers become cheaper, so we can afford to perform more measurements and process the data faster. However, this also brings challenges.The goal of this thesis is to enumerate these challenges and to provide possible solutions. The first challenge is related to the fact that the existing metrological recommendations are mostly based on the previous practice, when we could only afford to have a small number of measurements. In this regard, our objective is to describe the related problem and to propose a solution to this problem. These description (on the example of the design of …

Magnetic Structures Of Sawtooth Olivines Mn2six 4 (X = S, Se) Determined Through Neutron Powder Diffraction, Melaku Sisay Tafere

Open Access Theses & Dissertations

In olivine chalcogenide Mn2SiX 4 (X = S, Se) compounds, the Mn lattice produces a sawtooth, which is of critical significance in magnetism due to the potential for manifesting at bands in the magnon spectrum, a crucial component in magnonics. The compounds Mn2SiS4 and Mn2SiSe4 in Mn2SiX 4 family undergo antiferromagnetic phase transitions at T â?? 85 K and â?? 66 K, respectively, as determined from the specific heat, Cp(T). The average and local crystal structuresare determined using synchrotron X-ray, neutron diffraction, and X-ray total scattering data followed by Rietveld and pair distribution function (PDF) analysis. It is found from …

Mental Illness Labeling In Justice-Involved People, Elena Therese Vaudreuil

Open Access Theses & Dissertations

While it cannot be denied that there is a strong correlational relationship between justice-involvement and mental illness, research has demonstrated that severe mental illness is rarely the direct cause of criminal activity. However, stigmatizing attitudes towards people with mental illness are often rooted in incorrect generalizations regarding the link between mental illness and unpredictable, dangerous behavior, which can be magnified by labels (e.g., "schizophrenic" or "criminal"). This reduction of a person to a label results in a number of negative outcomes, ranging from the prejudice and inequitable treatment one may experience from groups such as justice workers, police, and employers …

Determination Of Oxidation-Reduction Potential And Iron Chemistry For Solutions Generated During The Hydrometallurgical Extraction Of Copper, Jiahao Xu

Open Access Theses & Dissertations

Oxidation-reduction potential (ORP) based on iron chemistry is one of the key operating parameters during the hydrometallurgical extraction of copper. A novel ORP equation was developed previously only based on the variables of temperature and nominal ferric/ferrous ratio to predict the redox potential of the quaternary H2SO4-Fe2(SO4)3-FeSO4-H2O system. However, its applicability in more complex acidic iron sulfate solutions during the hydrometallurgical extraction of copper with different temperatures, acidic concentration, cupric concentration, nominal ferric/ferrous ratio, and total and l iron concentration has not been extended and validated. This work evaluates the applicability of novel oxidation-reduction potential equation in the H2SO4-Fe2(SO4)3-FeSO4-H2O and …

Automated License Plate Recognition Systems, Nicholas Noboa

Master's Theses and Capstones

Automated license plate recognition systems make use of machines learning coupled with traditional algorithmic programming to create software capable of identifying and transcribing vehicles’ license plates. From this point, automated license plate recognition systems can be capable of performing a variety of functions, including billing an account or querying the plate number against a database to identify vehicles of concern. These capabilities allow for an efficient method of autonomous vehicle identification, although the unmanned nature of these systems raises concerns over the possibility of their use for surveillance, be it against an individual or group. This thesis will explore the …

The Effects Of Esports On Sport-Confidence And Imagery In Athletes, Kelton Mahon

Electronic Theses and Dissertations

With the growing popularity of esports, athletes may be able to experience potential cognitive and performance-related benefits as a result of watching others play esports. In the current study, student athletes were randomly assigned to watch a sport esport video or a control esport video and then completed measures of sport-confidence and imagery. It was predicted that participants in the sport esport video group would score higher than the control esport video group in the cognitive efficiency and resilience aspects of sport-confidence, as well as the cognitive general, motivational general-mastery, and motivational general-arousal domains of imagery. The overall results did …

Effects Of Prescribed Fire Regimes On White-Tailed Deer (Odocoileus Virginianus) Browse, Forage, And Nutrient Availability In The Pineywoods Ecoregion Of Texas, Wyatt L. Bagwell

Electronic Theses and Dissertations

Fire is a management tool for white-tailed deer (Odocoileus virginianus) habitat, influencing browse availability, herbaceous production, and nutrient content. In 2020 and 2021, this study utilized 46 plots across East Texas to assess these habitat components. A stem count index survey method was used to assess browse utilization prior to April in both years, and preferred browse species were clipped and analyzed for nutrient availability, and herbaceous production was also measured. Additionally, white-tailed deer population data, browse survey data, and recent fire history were obtained from five different wildlife management areas to examine their relationship. Deer had preferences …

Turning Ligands On Their Side: Computational Investigation Into The Binding Of N2o And N2 In Transition Metal Complexes, Cole Donald

Electronic Theses and Dissertations

Common greenhouse gas nitrous oxide (N₂O) is a thermodynamically potent and environmentally benign oxidant, making it a desirable target for metal center activation. Unfortunately, N₂O is a poor ligand for transition metals due to its weak sigma-donating and pi-accepting properties; as a result, few transition metal complexes capable of interacting with N₂O have been found. As the primary source of all nitrogen in organisms, abundant gas dinitrogen (N₂) is a crucially important tiny molecule and an essential part of daily existence. However, due to its inertness, it has limited practical uses in …

Escape Beneath: An Original Game Score Inspired By An Analysis Of Garry Schyman's Music, Daniel Cooper

Electronic Theses and Dissertations

Video-game music has grown into a vast array of different styles, sounds, and applications. As a newer field of music, game scoring has begun to receive high acclaim. Garry Schyman has become one of the most successful composers within the video-game industry. His music has received many awards and nominations throughout the years. Despite this, research and analysis into his compositions and techniques are almost non-existent. This thesis studies his techniques within the video-game scores for BioShock, BioShock 2, BioShock Infinite, Middle Earth Shadow of War, and Torn; and then applies them into an original …

Mle And Eap Methods For Estimating Ability Scores For Data Of Varying Sample Size And Item Length, Sahar Taji

Graduate Theses and Dissertations

In this research, the performance of two popular estimators, Maximum Likelihood Estimator(MLE) and Bayesian Expected a Posteriori (EAP) is studied and compared in estimating the latent ability score in an Item Response Theory (IRT) model. The 2-Parameter Logistic (2PL) IRT model which is characterized by difficulty and discrimination item parameters is used to estimate the latent ability scores. Several datasets are generated for variety of sample size and item length values. The Monte-Carlo simulation is used to analyze the performance of the estimators. Results show that MLE produces reliable results with low root mean square error (RMSE) across all datasets. …

Micronutrient Concentration Effects On Lettuce Growth And Susceptibility To Pythium, Kalyn M. Helms

Graduate Theses and Dissertations

In hydroponic production waterborne pathogens such as Pythium are ubiquitous and continually threaten a wide range of Controlled Environment Agriculture (CEA) crops in hydroponic production, including but not limited to: lettuce, spinach, basil, arugula, cucumber, tomato, sweet pepper, roses, chrysanthemums, and cannabis (Sutton et al., 2006; Gull, 2002; McGehee and Raudales, 2021; Gillespie, 2020). Despite extensive sanitation measures, disease control in hydroponics is fallible and requires constant surveillance and management to minimize outbreaks (Sutton et al., 2006). A potential disease suppression strategy is to increase micronutrient concentrations within hydroponic systems to naturally strengthen plant defenses against pathogens such as Pythium. …

Thermal Inactivation Kinetics Of Salmonella In Milk Powder As Impacted By Water Activity And Powder Type, Erika Litta Kadas

Graduate Theses and Dissertations

Historically, low-water activity (aw) foods (aw <0.65) were considered to be microbiologically safe for consumption. However, these foods have been implicated in outbreaks of pathogens such as Salmonella enterica, at a frequency that surely challenges this assumption of safety. Although usually implicated in outbreaks involving poultry and egg products, Salmonella spp. have frequently been the culprit in several outbreaks and recalls associated with low-water activity foods (LWAF) due to contamination resulting from the environment, animals, or even the employees during pre-or post-processing. One such LWAF that has been associated with Salmonella spp. outbreaks is milk powder. Milk powders are used in a variety of products ranging from infant formula to confectionary goods. With their widespread use, improving their safety is imperative. A key step in improving their safety is to thoroughly investigate preventive controls related to milk powder processing. The Food Safety Modernization Act (FSMA) established the Preventive Controls for Human Foods Rule, which mandates that processors design and establish a food safety plan outlining any potential hazards and the steps they will take to ensure those hazards do not compromise the safety of the product. Presently, the dairy industry does not have an established kill-step for milk powders post-spray drying. Spray drying may reduce some microbial populations, however, desiccation(e.g., spray drying) is not considered a kill-step. The work outlined in this thesis aims to assist our dairy industry partners in establishing their own thermal process for milk powders post-spray drying. Moisture sorption isotherms of two milk powders (nonfat dry milk: NFDM and a milk protein concentrate with 85% protein content: MPC-85) were determined and showcased that the temperatures at which the isotherms were determined (23, 40, or 60°C) significantly affected both the adsorption and desorption isotherms (p<0.0001) for each powder. Secondly, the thermal inactivation kinetics of Salmonella spp. in both powders were evaluated at two different water activities (0.20 and 0.30) and three temperatures (75, 80, and 85°C) to determine the effect of water activity on the thermal resistance of a cocktail of Salmonella spp. The D-values of Salmonella were heavily influenced by the thermal treatment temperature (p< 0.0001), but not the water activity (p >0.05). The overall findings contained within this thesis provide valuable information about the thermal inactivation kinetics of Salmonella spp. to our partners in the dairy industry so that they may implement an appropriate thermal process for their milk powders.

Mosaico De Fantasía: A Collection Of Microrrelatos And Short Stories, Jennifer Gutierrez

Theses and Dissertations

Art is subjective, as is the art of writing. Creating a piece of writing out of a fleeting thought is truly the most frightening yet fulfilling feeling there is for a writer. Entire universes with their own unique worlds, aesthetic verses littered with imagery to paint an intricate mental picture; each representing a brief scenario that my mind decided to fabricate out of nothingness. Though not everyone will love my work, my goal is to reach someone that might. Even if it’s just one person. I want them to read my work and think “This is pretty cool.” My …

55(3) Front Matter

UBC Law Review

No abstract provided.

Regulation Of Health-Related Artificial Intelligence In Medical Devices: The Canadian Story, Michael Da Silva, Colleen M. Flood, Matthew Herder

UBC Law Review

No abstract provided.

The Major Project Of Reconciliation: Locating An Indigenous Consent Standard Within The Bc Environmental Assessment Act, 2018, Josh Friedman

UBC Law Review

No abstract provided.

Directors' Liability In Canadian Tax Law: Critically Analyzing The Due Diligence Standard, Samuel Singer, Monica Cheng

UBC Law Review

No abstract provided.

Canada Stands Alone: A Comparative Analysis Of The Extraterritorial Reach Of State Human Rights Obligations, Leah West

UBC Law Review

No abstract provided.

Space Arbitration And Harmful Interference Disputes, Laura Yvonne Zielinski

Journal of Space Law

No abstract provided.

Satellite Data And Imagery As Evidence, Ronald J. Rychlak, Sean Patrick Taylor

Journal of Space Law

No abstract provided.

The Nebraska 4-H Equine Advancement Level Program’S Role In Positive Youth Development Using The Five Cs Model: An Exploratory Study, Eunhye Mccarthy

Department of Animal Science: Dissertations, Theses, and Student Research

Positive youth development (PYD) focuses on developing the strengths of youth through positive activities and behaviors rather than reducing negative tendencies. A well-researched model of PYD is the five C’s model that is popularly used in youth development organizations such as 4-H. The Nebraska 4-H Equine Advancement Level program was intended to serve as a guidebook for instruction and assessment of youth as they learn more about horses and horsemanship skills. Each of the four levels has an emphasis in developing a 4-H member’s responsibility, self-discipline, self-reliance, patience, and pride of accomplishments. The program was started approximately 30 years ago …

Recent Advances To Overcome Methane Hydrate Formation Challenges Using Nanostructure Promoters: A Mini Review Towards Industrialization, Mohsen Hosseini

Journal of Applied Sciences and Nanotechnology

Natural gas has recently drawn considerable attention due to its low emissions upon combustion. Pipeline transmission of natural gas is costly and always encounters different obstacles. Therefore, an effective industrial alternative for the storage and transmission of natural gas is needed. Hydrates, also known as solidified natural gas, have been proven to be a more feasible replacement compared to pipeline transmission, CNG, or LNG. Scientists have introduced promoters to shorten the induction time, increase the storage capacity, and improve the stability of hydrates. Nanostructure materials have demonstrated promising promotion results, suggesting a bright future and a critical step in the …

2d Particle-In-Cell/Monte Carlo Collision Simulation Of Zn-C Mosaic Target Erosion, Ali Addie, Raid Ismail, Mudhafar Mohammed

Journal of Applied Sciences and Nanotechnology

In this work, a simulation analysis of a commercial magnetron sputtering source was performed using the finite element method Particle-in-Cell/Monte Carlo Collision (PIC/MCC) to optimize the configuration of the Zn-C mosaic target. The magnetic field distribution was solved in a two-dimensional cylindrical coordinate system, and particles such as electrons, atoms, and charged ions of argon, zinc, and carbon were tracked in a DC magnetron sputtering system. The sputtering yield profile and particle flux for the eroded target were studied considering the ion and electron density distributions. The maximum sputtering flux of zinc and carbon was 1.975´1021 m-2.s-1 and 3.7´1018 m-2.s-1 …

Discipline Strategies, Gender, And Disabilities That Impact The High School Graduation Rates Of African American Students With Special Needs., Danielle Corbie-Archey

Dissertations (2016-Present)

Abstract

The purpose of this study was to determine if discipline strategies, gender, and disabilities impact the successful cohort graduation of African American students with special needs. While much research has been conducted to investigate the achievement gap and discipline gap, there is a paucity of research on how discipline affects the graduation rate of this population. Furthermore, this research is also to expose the inequities within the special education system. A quantitative research design was selected to study the graduation rates of African American students over the past years from 2017 to 2020. For this study, data regarding Five-Year …

Towards The Electronic Response Of Carbon-Based Van Der Waals Heterostructures In A Diamond Anvil Cell, George Thomas Foskaris

UNLV Theses, Dissertations, Professional Papers, and Capstones

The nanoscale regime of materials has been at the forefront of research and interest in condensed matter physics for many years. In a merger of the fields of two-dimensional (2D) materials and high pressure physics, we present an investigation of the electronic response of carbon-based, van der Waals (vdW) heterostructures in a diamond anvil cell (DAC). Combining these fields presents us with the ability to study the characteristics of such systems both optically, and through electrical transport. Properties such as conductance, band structure, and layer number are considered. The samples in this study are assembled using exfoliation and stacking techniques …

Reparations For The Wrongly Convicted, Gillian Trost

Undergraduate Theses and Capstone Projects

Wrongly convicted persons should be offered reparations in instances where they have suffered or faced harm as a result of their wrong conviction. Harms can include, but are not limited to, losing physical time, mental health damages, monetary harm, and damages to the person’s reputation. Harms are anything that has diminished a person's quality of life throughout the conviction process and even after exoneration. Failure to offer reparations to these persons is unethical and reparations are a necessary consequence when the judicial system convicts the wrong person. Failure to offer reparations also lessens the judicial system’s accuracy and reliability when …

Evaluating Post-Training Engagement, Alyssa B. Trinity, Caitlyn D. Gonzalez

Capstone Projects and Master's Theses

Impact Launch (IL) is a collective of social impact professionals dedicated to creating sustainable and equitable change. IL provides strategic planning, project design, collaborative capacity building, coaching, and leadership intensives. Similar to those who’ve undergone other training programs, alumni of IL’s leadership training are prone to becoming disengaged with the tools and stagnant in their learning. The purpose of this project was to begin efforts to increase alumni engagement with the tools and each other through conducting a series of interviews. Six alumni were interviewed to collect feedback on how IL can better support engagement. The major expected outcome for …