Digital Commons Network^™

Detailed Analysis Of Convective Simulations From A Wrf Microphysics Ensemble, Joshua Markel

Theses and Dissertations

This study performed a detailed analysis of convective storms across the Contiguous United States from 77 case dates using a 4-member microphysics Weather Research and Forecasting (WRF) ensemble and Stage IV gauge-adjusted radar derived precipitation. Dates included the 2016 NOAA Spring Forecast Experiment (SFE) with the remainder from 2010-2012. Quantitative attributes of precipitation objects in both simulations and observations were diagnosed using the Method of Object-Based Diagnostic Evaluation Time-Domain (MODE-TD). The microphysics schemes tested were WSM6, Thompson, Morrison, and Milbrandt.

Among all simulation case dates, compared to observations, the number of precipitation objects less than 90 km in length are …

The Impact Of The 340b Drug Pricing Program On Post-Launch Drug Prices, Bryan Temples Miller

Theses and Dissertations

Government mandated drug-pricing policies are an understudied—but potentially significant—factor in the price of drugs. The 340B program is one of the more controversial government-mandated prescription drug discount programs. Proponents argue that the program helps health care systems cover the cost of care they provide for low-income patients. Critics argue that the program unfairly benefits certain health care systems by assuring them lower drug prices, drives consolidation and reduces competition in the health care market, and drives up the cost of drugs. Despite this last claim, there is very little evidence that the 340B program actually impacts post-launch drug prices (i.e., …

Residual Deficits Observed In Athletes Following Concussion: Combined Eeg And Cognitive Study, Tamanna Tabassum Khan Munia

Theses and Dissertations

The neurocognitive sequelae of a sport-related concussion and its management are poorly defined. Emerging evidence suggests that the residual deficits can persist one year or more following a brain injury. Detecting and quantifying the residual deficits are vital in making a decision about the treatment plan and may prevent further damage. For example, improper return to play (RTP) decisions in sports such as football have proven to be associated with the further chance of recurring injury, long-term neurophysiological impairments, and worsening of brain functional activity.

The reliability of traditional cognitive assessment tools is debatable, and thus attention has turned to …

Failure Analysis Of Rotating Equipment Using Vibration Studies And Signal Processing Techniques, Ashkan Nejadpak

Theses and Dissertations

This thesis focuses on failure analysis of rotating machines based on vibration analysis and signal processing techniques. The main objectives are: identifying machine’s condition, determining the faults specific response, creating methods to correct the faults, and investigating available statistical analysis methods for automatic fault detection and classification. In vibration analysis, the accelerometer data is analyzed in time and frequency domain which will determine the machine’s condition by identifying the characteristic frequencies of the faults. These fault frequencies are specific for each type of machine’s faults. Therefore, they are referred to as faults’ signatures. The most common faults of the rotating …

Lightcurve Study Of V-Type Asteroids, Matt Nowinski

Theses and Dissertations

A massive impact event on (4) Vesta is believed to have created the Vesta family of asteroids (Asphaug, 1997). The rotational characteristics of the Vesta family provide important clues about this event, including its timing, the make-up of the resulting debris, the subsequent migration of members of the family into Earth-crossing orbits, and the deposition of the Howardite-Eucrite-Diogenite meteorites on the Earth’s surface. This study conducted lightcurve measurements of ten Vp-type asteroids, drawn from an asteroid taxonomy defined by Carvano et al. (2010) and based on the Sloan Digital Sky Survey (SDSS) Moving Object Catalogue (MOC4). These measurements identified a …

The Influence Of Rural Primary Care Providers Level Of Stigma On Recognition Of Suicidal Ideation In Patients, Megan Obert

Theses and Dissertations

Although there has been an abundance of research in the last thirty years about primary care providers (PCPs) last contact with patients before they completed suicide, little is known about what may impede a PCPs ability to identify suicidal ideation in patients. The current study investigated implicit and explicit bias toward mental illness compared to physical illness among PCPs and students and how this may affect clinical decision making and identification of suicidal ideation in patients. The participants completed an online survey which assessed implicit stigma, explicit stigma, and clinical decision making in regard to a vignette that depicted a …

Pore-Size Distributions From Nuclear Magnetic Resonance And Corresponding Hydrocarbon Saturations In The Devonian Three Forks Formation, Williston Basin, North Dakota, Kyle James Peterson

Theses and Dissertations

Pore-size distributions of four lithofacies from the Three Forks Formation were obtained using nuclear magnetic resonance (NMR). The upper Three Forks was divided into three lithofacies with the fourth coming from the uppermost section of the middle Three Forks. In ascending order the lithofacies studied were: 1) massive green to greenish-gray mudstone, 2) highly deformed, interlaminated pinkish-tan silty dolostone and green to greenish-gray mudstone, 3) thinly laminated pinkish-tan silty dolostone and 4) interlaminated green to greenish-gray mudstone and pinkish-tan silty dolostone.

Core samples (one sample per lithofacies) of various sizes and shapes were selected for six western North Dakota wells. …

Oil Generation Rate Index Using Arrhenius Equation For Bakken Formation, Chioma Judith Onwumelu

Theses and Dissertations

Oil generation rate index is important in considering oil well performance. An oil generation rate index was estimated for ten wells in the Bakken Formation in the North Dakota portion of the Williston Basin. Activation energies consistent with a fixed frequency factor (1x10-14/sec) and estimates of the current temperature within the Bakken Formation were used to calculate a reaction rate. The reaction rate was converted into a generation rate index by multiplying the reaction rate by the mass of crackable kerogen derived from programmed pyrolysis (SRA) S2 analyses and bulk density logs. The programmed pyrolysis temperature of 435у, production index …

Stigma And Restoration Of Civil Rights To Felons, Kimberly Paige Pithey

Theses and Dissertations

Millions of people in the United States are banned from basic civil rights including participation in voting, jury duty, applying for government assistance, and owning a firearm because they have had a felony conviction. There is limited research on attitudes regarding the restoration of civil rights to felons. This thesis uses Goffman’s theory of stigma to examine whether public support for the restoration of rights to felons is associated with knowledge of felony convictions and whether an individual knows someone with a felony conviction. This study used an online survey of college undergraduates (N = 362) to explore two hypotheses …

Developmental Factors And Maladjustment Indicators Of Specific Sexual Interests, Victoria Charlotte Mary-Rose Pocknell

Theses and Dissertations

Human sexual expression appears to be freer to vary past the need to procreate. This study explores the variability in the cues that elicit sexual arousal in the general population. It aims to better understand the developmental factors and negative outcomes of having a specific sexual interest. A sample (N = 1069) was gathered using Amazon’s Mechanical Turk in which participants indicated sexual interests based on themes: Age, Physical Appearance, Clothing, Power, Risk, and Extrapersonal. The results suggest significant effects of sex, age, and hypersexuality on sexual interests. Therefore, analyses were run separately for men and women and age and …

Optimal Control Of Induction Machines To Minimize Transient Energy Losses, Siby Jose Plathottam

Theses and Dissertations

Induction machines are electromechanical energy conversion devices comprised of a stator and a rotor. Torque is generated due to the interaction between the rotating magnetic field from the stator, and the current induced in the rotor conductors. Their speed and torque output can be precisely controlled by manipulating the magnitude, frequency, and phase of the three input sinusoidal voltage waveforms. Their ruggedness, low cost, and high efficiency have made them ubiquitous component of nearly every industrial application. Thus, even a small improvement in their energy efficient tend to give a large amount of electrical energy savings over the lifetime of …

An Investigation Of The Thermal Degradation Of Lignin, Sara Pourjafar

Theses and Dissertations

The goal of this research was to explore selected non-biological lignin decomposition reactions to determine if these reactions have the potential to generate fuel and chemical intermediates in a commercially feasible manner. Two different strategies were employed: 1) metal doped silica-alumina and γ-alumina catalytic decomposition reactions, and 2) base catalyzed sub- and supercritical water liquefaction.

The first strategy was built upon previous research to explore metal doped silica-alumina and γ-alumina catalytic lignin decomposition reactions in a batch reactor system. Commercially available silica-alumina and γ-alumina catalysts were individually doped with 5 and 10 wt % of molybdenum or copper via a …

The Effects Of Subject Presentation Types In Problem Based Learning (Pbl) Problems On Student Motivation: A Pbl Implementation In Speech Language Pathology, Elaine Kim Pyle

Theses and Dissertations

Problem-Based Learning (PBL) is an evidence-based instructional approach designed to maximize one’s ability to use static knowledge as evidence for solving authentic problems (Barrows, 1986). Students have been observed as underprepared or skipping steps during the PBL process due to fatigue or low motivation (Czabanowska, Moust, Meijer, Schr��-B夫, & Robertson, 2012). This study considered the impact of the presentation of the PBL subject (i.e., the key character involved in the problem) on student motivation within the context of Speech and Voice Science curricula. The results of this mixed-methods study showed the frequency of engagement behaviors declined overall. Although engagement levels …

Immune Regulatory Mechanism And Myeloid Cells Functions In Brain Parasite Infection, Fredice Quenum Zangbede

Theses and Dissertations

Neurocysticercosis (NCC) is the most common parasitic infection of the central nervous system (CNS) caused by the helminth parasite Taenia solium (T. solium) and affects 50-100 million people worldwide. Its clinical symptoms include headache, seizures, hydrocephalus, epilepsy and stroke. These clinical symptoms can have life-long detrimental effects. As many as half of the total adult-onset seizures and 10% of the stroke cases in the endemic areas are attributed to NCC, whereas 20% to 30% of symptomatic patients display hydrocephalus. Treatment of NCC remains a major challenge as the severity of the symptoms is thought to be elicited by the degenerating …

Modeling The Interactions Between Turbulence And Radiation In Oxy-Combustion Flames, Md Ashiqur Rahman

Theses and Dissertations

In order to accurately estimate radiative heat transfer in turbulent combustion systems, one needs to take into account the non-linear interactions between the temporally fluctuating species and temperature variables and the radiation field. Simply employing time-averaged values of these variables in the radiation calculations to estimate absorption and emission (as is commonly done in the modeling community) can result in gross errors in the estimation of the radiative fluxes. Therefore, models that account for these Turbulence-Radiation Interactions (TRI) have been proposed in the literature to improve the fidelity of the radiative transfer calculations. TRI models accomplish this by computing appropriate …

Effects Of Non-Conventional Gas And Oil Production Activities On Local And Regional Fine Particles And Ground-Level Ozone, Swetha Mallula

Theses and Dissertations

Unconventional oil and gas production in North Dakota and Texas has been rising significantly since 2007 with the advances in hydraulic fracturing technology. The effects of unconventional oil and gas production on the environmental quality and public health, however, are not well understood. The goal of this study was to investigate the effects of unconventional energy production on two types of air pollutants (fine particles and ground-level ozone). We analyzed the air quality data from publicly accessible sources, focusing on two major oil producing states (North Dakota, Texas) and two control states (Minnesota and Connecticut). The specific objectives of this …

Design And Manufacture Of A Negative Index Metamaterial Using A Magnetized Photonic Crystal, Mohamed Zein Radwan

Theses and Dissertations

Negative index materials (NIM) are artificial structures in which the refractive index for light has a negative value over some frequency range. This does not occur in any known natural materials, and thus is only achievable with engineered structures known as metamaterials. Metamaterials demonstrating a negative refractive index for light usually consist of arrays of wires and cut-ring structures: such media are characterized by both the electrical permittivity and magnetic permeability being negative. My method for obtaining a NIM is different from previous attempts. I get the negative magnetic permeability from a ferrite material which is the host medium for …

Chromatographic Analysis Of Low Molecular Weight Polar Compounds In Complex Environmental Matrices And Renewable Materials, Jana Rousova

Theses and Dissertations

One of the challenges in characterization of complex environmental matrices and renewable materials is the determination low molecular weight polar compounds (LMWPCs). Depending on the matrix, the targeted LMWPCs include acids, aldehydes, sugars, sugar alcohols or aminoacids. To investigate the role and impact of these species, a development of accurate and precise analytical protocols is essential. One of the challenges in analysis of LMWPCs is their volatility and thus potential losses during sample preparation. The various matrices including renewable materials may contain >100 compounds that are either non-targeted (i.e., their identity is not known prior to the analysis) or targeted …

Effect Of Bio-Binders On Binder And Mix Properties With High Rap Content, Rajib Chandra Saha

Theses and Dissertations

The use of Recycled Asphalt Pavement (RAP) has significantly increased in construction and rehabilitation of flexible pavements to ensure proper utilization of limited natural resources. Recycling also provides a greater environmental benefits and energy conservations. It saves the lands from being the dumping site, conserves energy, and reduces the emission of greenhouse gases. But high RAP in the HMA mix increases the stiffness and may result in cracking. Bio-binders could reduce the stiffness of binder and mixes with high RAP content. Two oils, namely Waste Cooking Oil (WCO), and Soy Oil are potential sources of bio-binder that are abundant and …

Quantification Of Lignin Hydroxyl Containing Functional Groups Via 31p{1h} Nmr Spectroscopy And Synthesis Of Lignin Degradation Standards, Joshua E. Schumaker

Theses and Dissertations

The focus of this thesis is on the structural characterization of lignin, a complex phenol-based heteropolymer. In the first part of the study, functionalization of lignin and its known degradation products by 2-chloro-4,4,5,5-tetramethyl-1,3,2-dioxaphospholane (TMDP) and analysis by 31P NMR spectroscopy was investigated. Chemical shifts of derivatized alcohols, phenols, and carboxylic acids were determined that allowed for qualitative characterization of lignin. This approach was further applied for the quantitative analysis of OH-containing groups present in lignin employing the internal standard. Lignin samples, fractionated by gel permeation chromatography (GPC) based on molecular weights, were derivatized by TMDP and characterized by 31P NMR …

The Role Of Α-Synuclein In Brain Lipid Metabolism And Inflammation, Drew R. Seeger

Theses and Dissertations

Alpha-synuclein (Snca) is a small cytosolic protein that is ubiquitously expressed in the nervous system and comprises 0.5-1% of all cytosolic protein, but its biological function is poorly understood. Although Snca function has been studied in lipid metabolism, the function of Snca in brain lipid metabolism under inflammatory conditions is yet to be elucidated. We utilized several model systems including primary cultured astrocytes and microglia, Snca deficient and mutant knock-in mice, and a radiolabeled free fatty acid steady state-kinetic mouse model to determine Snca role in neuroinflammation. Herein, we have determined several major roles of Snca during inflammation: (i) dBcAMP …

Enhanced Optical Wireless Channel For Indoor And Intravehicle Communications: Power Distribution And Signal To Noise Ratio Analysis, Rana Rageh Shaaban

Theses and Dissertations

Visible light communication—(VLC) provides wide bandwidth and high security

capabilities for free space optical communication. This thesis presents the key concepts,

underlying principles and practical applications of visible light communications. In

particular, this thesis focuses on the received power distribution pattern and signal to noise

ratio for line-of-sight indoor and vehicular applications. Several methods are used to

modify the SNR and power distribution levels. It is shown that in the absence of

obstruction, the optical footprint is nearly circular and offers a platform for large- scale

deployment in commercial environments, which is similar to micro and Pico cells.

By studying …

Testing An Integrative Model Of Depressive Symptoms With A Sample Of Latina/O Youth, Diana Slivensky

Theses and Dissertations

Latina/o youth represent a significant portion of the United States population and experience depressive symptoms at greater rates than other racial and ethnic groups. Prior research has found relationships between the cultural adaptation process and negative

mental health outcomes. The purpose of the present study was to test a model of depressive symptoms with a sample of Latina/o youth that aimed to explore the relations among acculturation, enculturation, bicultural stress, adherence to cultural values (i.e., familismo and respeto), family cohesion, and perceived peer support. Additionally, the present study examined gender differences among all the aforesaid variables. Participants included 156 Latina/o …

A Comprehensive Analysis Of Clouds, Radiation, And Precipitation In The North Pacific Itcz In The Nasa Giss Modele Gcm And Satellite Observations, Ryan Evan Stanfield

Theses and Dissertations

Global circulation/climate models (GCMs) remain as an invaluable tool to predict future potential climate change. To best advise policy makers, assessing and increasing the accuracy of climate models is paramount. The treatment of clouds, radiation and precipitation in climate models and their associated feedbacks have long been one of the largest sources of uncertainty in predicting any potential future climate changes.

Three versions of the NASA GISS ModelE GCM (the frozen CMIP5 version [C5], a post-CMIP5 version with modifications to cumulus and boundary layer turbulence parameterizations [P5], and the most recent version of the GCM which builds on the post-CMIP5 …

Inner Strength In Men-A Descriptive Phenomenology, Charles S. Smith

Theses and Dissertations

The purpose of this descriptive phenomenologic study was to explicate the eidetic structure and essence of inner strength in men. Based in the philosophy of Husserl (2012) and developed from the methodology of Giorgi (2009), inner strength in men emerged as a unique phenomenon comprised of five structural themes: 1) mentally managing; 2) purposefully moving; 3) intentional normalizing; 4) intentional connecting; and, 5) mobilizing self to get through. The essence of inner strength in men was “purposefully moving ‘through a glass darkly’ to get to the other side.”

Twelve men aged 50 years or older (m = 60.25 years) shared …

Investigation Of Rcf Life Of Hollow Components For Additive Manufacturing, Subodh Chandra Subedi

Theses and Dissertations

Advancements in manufacturing and material technology has redefined the approach of design for machine components. Additive manufacturing processes have enabled designers to manufacture for design and functionality. With Design for Additive Manufacturing (DfAM) approach, components can be manufactured with holes in them, including rolling contact components. These hollow components save material, weight, have shorter manufacturing lead times and possibly a higher rolling contact fatigue resistance. Hollowness is defined as the volume percentage of intentional void in load carrying member. Finite element analysis is performed to obtain compressive and tensile stresses on rings and square plates with centric holes in them. …

Outcrop Mapping Using Unmanned Aerial Systems And Modeling Of The Shannon Sandstone In The Powder River Basin, Emily Grace Sundell

Theses and Dissertations

Mapping steep outcrops by hand is dangerous, time consuming and gathering images parallel to a cliff face is difficult to nearly impossible. Wyoming has many extensive, steep, surface outcrops that in the subsurface are petroleum-producing formations. The Powder River Basin (PRB) of Wyoming has been a prolific producer of petroleum since the late 1800s, and with continual advances in technology production continues to increase. During the Cretaceous, the PRB was inundated by the Western Interior Seaway. Sand-clay sequences corresponding to transgressions and regressions were deposited and resulted in the Campanian Shannon Member of the Cody Formation. The Shannon Member thickens …

Performance Analysis Of Automatic Dependent Surveillance-Broadcast (Ads-B) And Breakdown Of Anomalies, Asma Tabassum

Theses and Dissertations

This thesis work analyzes the performance of Automatic Dependent Surveillance-Broadcast (ADS-B) data received from Grand Forks International Airport, detects anomalies in the data and quantifies the associated potential risk. This work also assesses severity associated anomalous data in Detect and Avoid (DAA) for Unmanned Aircraft System (UAS). The received data were raw and archived in GDL-90 format. A python module is developed to parse the raw data into readable data in a .csv file. The anomaly detection algorithm is based on Federal Aviation Administration's (FAA) ADS-B performance assessment report. An extensive study is carried out on two main types of …

A Geostatistical Analysis Of Housing Prices In Fargo, Tika Lamitare

Statistics

This study investigated housing prices by applying geostatistical regression techniques to identify the significant factors affecting residential housing sales prices in Fargo, North Dakota. The study used a subset of residential housing price sales data for the year 2015. The study found moderate spatial dependency among properties. Some of the statistically significant variables were found to be age, total area of property, number of parking spots, air conditioner and the status of basement finish. Finally, predictions on new locations were made based on ordinary linear regression model and regression kriging technique used for the geostatistical models.

Mimic-Women: Twentieth-Century American Women On The Edges Of Exploration, Michele R. Willman

Theses and Dissertations

Women have been involved in exploration as adventurers, discoverers, mountaineers, and botanists for centuries. Yet, women have largely been unrecognized as explorers. This project shows that women in exploration have had to practice physical and rhetorical strategies to overcome historical and traditional gender biases in exploration and its related fields. Expanding on Homi Bhabha’s explanation of colonial mimicry, I argue that twentieth-century American women explorers practiced a form of gender-based mimicry to make their presence in exploration possible. At times, they mimicked their male explorer-counterparts such as when they inhabited the imperial gaze. At other times, they employed gendered rhetorical …