Digital Commons Network^™

Evaluation Of Gas Hydrate In Gas Pipeline Transportation, Paschal Ogadi Mokwenye

Theses and Dissertations

Hydrate formation and deposition is an inherent problem in the gas production industry. It causes plugging in pipelines and damages to equipment such as pumps and separators. The safest and most cost-effective strategy in preventing hydrate formation is predicting their formation temperature or pressure. This study involves the development of an empirical model to calculate the hydrate formation temperature by carrying out nonlinear regression on 460 experimental data points using MATLAB software. The values were compared to five other reputable models. The model showed superior accuracy in calculating the reference experimental temperature over the other models. Also, the model produced …

Improvement Of Organoleptic Attributes Of Yellow Pea Flour Through An Emerging Green Technology: Supercritical Carbon Dioxide + Ethanol Extraction, Serap Vatansever

Plant Sciences

An increasing demand for following healthier eating pattern has created a rapidly growing food market, including more nutrient dense and healthier plant-based foods. Nutrient-dense yellow pea flour is ideal for addressing these new-generation foods. However, its utilization in foods is limited due to its unpleasant flavor. Therefore, an eco-friendly deflavoring method has recently been found effective to improve sensory quality of pulse ingredients. Supercritical carbon dioxide + ethanol (SC-CO2+EtOH) extraction was applied as deflavoring method. The goals of this research were to evaluate (1) the applicability of this extraction at optimized conditions to reduce off-flavor compounds of pea flour, and …

Introduction To Game Theory: A Discovery Approach, Jennifer Firkins Nordstrom

Linfield Authors Book Gallery

Game theory is an excellent topic for a non-majors quantitative course as it develops mathematical models to understand human behavior in social, political, and economic settings. The variety of applications can appeal to a broad range of students. Additionally, students can learn mathematics through playing games, something many choose to do in their spare time! This text also includes an exploration of the ideas of game theory through the rich context of popular culture. It contains sections on applications of the concepts to popular culture. It suggests films, television shows, and novels with themes from game theory. The questions in …

Seeding Date And Genotype Maturity Interactions On Grain Sorghum [Sorghum Bicolor –(L.) Moench] Performance In North Dakota, Kutay Yilmaz

Plant Sciences

Grain sorghum [Sorghum bicolor (L.) Moench] varieties fail to reach maturity in North Dakota’s short and cool growing season. The study objective was to evaluate seeding date and white grain sorghum genotypes. A randomized complete block design study was conducted at Carrington, Oakes, and Prosper, ND, in 2018 and 2019. Genotypes included two commercial hybrids and four open-pollinated genotypes. Reaching heading and anthesis, hybrids required more heat units (GDDs), compared with the open-pollinated genotypes. Highest grain yield was obtained from the first and second seeding dates. Earlier-maturing open-pollinated genotypes maintained yield across seeding dates, whereas yield was reduced at later …

Removal Of Blocking Artifacts From Jpeg-Compressed Images Using Neural Network, Md Nurul Amin

Theses and Dissertations

The goal of this research was to develop a neural network that will produce considerable improvement in the quality of JPEG compressed images, irrespective of compression level present in the images. In order to develop a computationally efficient algorithm for reducing blocky and Gibbs oscillation artifacts from JPEG compressed images, we integrated artificial intelligence to remove blocky and Gibbs oscillation artifacts. In this approach, alpha blend filter [7] was used to post process JPEG compressed images to reduce noise and artifacts without losing image details. Here alpha blending was controlled by a limit factor that considers the amount of compression …

Motor Competency's Relationship To Interpersonal Coordination In Stationary Basketball Dribbling, Daniel Bell

Theses and Dissertations

A gold standard for student pairing strategies in a physical education setting has still yet to be discovered and is a widely debated topic in the field. Inclusion and equitable learning environments are areas of emphasis for practitioners while trying to find new ways to elicit these things to benefit students. Interpersonal coordination (IC), a social phenomenon on which this study focused, has direct applications for pairing strategies in physical education. In essence, IC is a state in which two individuals non-consciously mimic each other’s motor patterns. IC was measured between 182 student pairings performing stationary basketball dribbling. Participants included …

Improving Numerical Reproducibility Of Scientific Software In Parallel Systems, Sara Faraji Jalal Apostal

Theses and Dissertations

Recently, numerical reproducibility has received increased emphasis from the scientific community. Software results that are not reproducible make it difficult to examine the science the software supports. A common source of numerical reproducibility errors in computational science occurs during floating-point arithmetic. Finite precisions and limited storage for floating-point numbers require computers to truncate and round results of some math operations. As a consequence, an approximate value is stored instead of the exact result. One programming idiom that is not always reproducible is the global sum reduction of a distributed array. Changing the number of compute units changes the order array …

Not Your Advisor’S Doctorate: The Doctor Of Arts And The Modernization Of Higher Education 1945-1970, Andrew Faber Larson

Theses and Dissertations

The “modernization” of higher education, 1945-1970, was a transitional period in American higher education. It was marked by a number of challenges that prompted rapid change in institutions around the United States. These changes were accompanied by expedient expansion in curriculum, faculty size, and physical plant of universities. One of the changes that came out of the period of modernization was the establishment of the Doctor of Arts degree as a way to produce professional faculty to fill open positions created by the rapid expansion of the modernization. As a result, the Doctor of Arts served as a modernization solution …

Elementary And Secondary Teachers’ Perceptions Of Native American Students’ Academic Performances In North Dakota, Andrew Younkam Mangwa

Theses and Dissertations

Low academic performance among Native American students has been a problem for several decades. Some researchers like Bradbury et al. (2012) have studied issues related to education, but have not targeted elementary and secondary school students’ academic performances. More needs to be done, specifically on Native American students’ academic achievements, to understand the problem and provide data that could potentially ameliorate the situation. Data on state assessments from North Dakota’s Department of Public Instruction has shown low academic performances for students from kindergarten through 12th grades in school districts with high Native American student enrollments (Insights.nd.gov, 2018). This quantitative study …

A Preliminary Study Of Leo To Geo Transfers For Inclination Changes Using Libration Point Orbits, John Shepard

Theses and Dissertations

The required change in velocity for a satellite to change inclination has prompted studies of efficient orbital transfers. Modeling the motion of a spacecraft by including the gravitational forces associated with the Sun, Earth, and Moon has historically proven effective in obtaining new scientific knowledge. In modeling the motion of satellites, the circular restricted three body problem (CR3BP) demonstrates the interactions from two primary bodies and a satellite. The dynamics created about the equilibrium points within the CR3BP can be used to construct low-energy transfers. The invariant manifolds of the libration point orbits (LPO) can be used to create an …

Change Theory And Perceptions Of Innovation From Educators Within K-12 Schools In The State Of North Dakota, Ryan P. Lyson

Theses and Dissertations

Throughout the years, policies and mandates have influenced education and forced many school districts, administrators, and teachers to change instructional practices, content, and the overall structure of the school day. Accountability is a common theme in education because many school leaders and districts are trying to work within the parameters given by the State of North Dakota in order to meet the requirements for the state standards which are founded on common core, accreditation visits, state-mandated assessments, and teacher-evaluation components. Innovation is a compelling topic in education; however, there has not been much research that focuses on North Dakota

The …

Predictive Ecology: Simulating Long-Term Changes In Forest Populations Responding To Various Reintroduction Methods Of The Bc3f3 American-Chinese Chestnut Tree., Shelby Dawn Young

Theses and Dissertations

Vida is an explicit biometric simulator tool used to predict multiple aspects of plant populations and community dynamics. Vida is a growth model combined with a reiterative algorithm. The software is written in Python and uses species-specific growth data to model virtual forest ensembles based on each species’ growth parameters. Biometric modeling tools like Vida are reliable because they are based on mathematically observed biological truths, of which scientists can use to enhance the predictive power of ecological approaches in different areas. These simulation outputs can be used to demonstrate the ways a forest grows over time. The user can …

Design Of Spouted Fluidized Bed Computational Models For Advanced Energy Applications, Ryder Shallbetter

Theses and Dissertations

Fluidization process technology has been widely studied since its first commercial uses during the 1920s. Initially, developmental progress was slow as fluidized beds are complex in design and often hard to scale up in size. However, with the emergence of computational fluid dynamics (CFD), researchers were able to simulate wide ranges of fluidization and create new fluidization designs to help solve complex problems. This study aims to determine if CFD can be effective in designing spout-fluid beds with draft tubes for advanced energy applications. CFD has been employed for studying the fluidization characteristics, design, and optimization of spouted beds. However, …

Modelling Of A Microgrid Using Z Notation, Binisha Shrestha

Theses and Dissertations

A Microgrid is a group of electrical sources and connected loads that operate energy grids in grid-connected or islanded mode. Microgrid usage has increased recently due to improved technology andthe effectiveness of renewable energy sources. To produce a balanced and stable power supply frommicrogrids and meet the load demand is a challenging research area in both the electrical engineering and software engineering fields. This work presents a formal model for representing the microgrid system to prevent failure or inconsistencies in the power generation and usage. A methodology for creating a formal model for a microgrid is a critical approach to …

The Influence Of High Intensity Turbulence And Secondary Flows On Slot Film Cooling Over An Aft Loaded Vane, Loren Soma

Theses and Dissertations

The purpose of this study is to experimentally investigate the effects of high turbulence and secondary flows on slot film cooling over an aft loaded vane (turbine blade) with a large leading edge. Turbine nozzle component cooling methods are challenged by very high combustor discharge temperatures, turbulence effects, and high acceleration requiring cooling methods to provide reliable and acceptable component life. Throughout the development of gas turbines, film cooling has become one of the most prevalent techniques to protect high pressure turbine airfoils and endwalls. Film cooling works by supplying a film of cooler than the freestream gas onto the …

Uncertainty Quantification And Economic Dispatch Models For The Power Grid, Arun Sukumaran Nair

Theses and Dissertations

The modern power grid is constrained by several challenges, such as increased penetration of Distributed Energy Resources (DER), rising demand for Electric Vehicle (EV) integration, and the need to schedule resources in real-time accurately. To address the above challenges, this dissertation offers solutions through data-driven forecasting models, topology-aware economic dispatch models, and efficient optional power flow calculations for large scale grids. Particularly, in chapter 2, a novel microgrid decomposition scheme is proposed to divide the large scale power grids into smaller microgrids. Here, a two-stage Nearest-Generator Girvan-Newman (NGGN) algorithm, a graphicalclustering-based approach, followed by a distributed economic dispatch model, is …

Application Of Formal Specification Technique To Microgrid Representation, Maksym Tkach

Theses and Dissertations

This thesis uses formal specification techniques to analyze and model a microgrid. A microgrid is a small, local electrical grid, often supplied by a single generator, that can connect to the larger electrical grid, but can also disconnect from it, going into “island mode.” Thanks to the growth in renewable energy, microgrids represent a growing segment of the electrical power generation domain. And like any member of the domain they are safety-critical systems, meaning that even a small mistake in their implementation risks damage to life and property.Formal specification is a way to abrogate the risks of safety critical systems …

Aqueous Imbibition With Enhanced Contact Area Approaches To Extract Oil From The Bakken Formation, Jin Zhang

Theses and Dissertations

The techniques of horizontal wells and hydraulic fracturing enable oil production from low-permeable shale, sandstone and carbonate rock formations. However, the extremely low permeability and porosity properties lead a sharp declination of oil production and a low oil recovery factor (typically, 5-15% of original oil in place) as reservoir pressures dropping. Surfactant EOR (enhanced oil recovery) has been considered as one of the best options for geological challenging formations. In our previous studies, we developed a method using surfactant formulation spontaneous imbibition to stimulate the oil recovery from tight formations through wettability alteration and the interfacial tension (IFT) reduction. However, …

Enhanced Hydrocarbon Recovery In Tight And Shale Reservoirs Using Surfactants And Supercritical Co2, Shaojie Zhang

Theses and Dissertations

The tight and shale oil reservoirs have been becoming increasingly important energy resources. However, the flow and storage mechanisms of oil in tight and shale reservoirs are still ambiguous. The inorganic pores, organic pores, and kerogen skeleton in shale oil reservoirs can store hydrocarbons. Besides, the oil recovery of tight and shale oil reservoirs is extremely low even with the assistance of hydraulic fracturing and horizontal drilling. The surfactants and CO2 are commonly used to enhance the oil recovery in tight and shale reservoirs. A comprehensive review of CO2 and surfactants EOR is shown in Chapter Ⅱ.

The spontaneous imbibition …

Method Lawyering: Immersion Teaching Illustrated, Kris Franklin

Articles & Chapters

Immersive law teaching uses simulated client experiences to drive the learning of legal doctrine, while enriching comprehension and mastery by integrating of a range of lawyering competencies. In an effort to “show, don’t tell,” this Article provides an immersive introduction to immersive teaching though the lens of a family law course. A series of vignettes illustrate student work in the class. The vignettes become jumping off points for more specific discussion of the nuts and bolts of teaching and learning the law in the course, and for broader consideration of possibilities for immersive learning in legal education.

Software Is Scholarship, Houman B. Shadab

Articles & Chapters

This Article provides the first systematic account and justification of software applications as works of scholarship. Software is scholarship to the extent that software functionality is derived from scholarly research, software is used as a means to develop scholarship, or software is used as a medium to communicate scholarly ideas. Software applications are superior to articles and books for communicating scholarly ideas because software is not limited by the constraints of traditional written works. Software can communicate using a wide variety of textual components, graphical elements, and programmable interactivity that significantly enhance the ability to communicate scholarly concepts, arguments, and …

Optimizing Winter Camelina Production As A Cover Crop In North Dakota, Alex Shawn Robert Wittenberg

Plant Sciences

Winter camelina [Camelina sativa (L.) Crantz] has gained particular interested from producers and researchers in the northern Great Plains and local production information is critical. Without a correct sowing date plant stand establishment can be challenging. Morphological differences between winter- and summer-biotypes of camelina can allow producers and researchers to distinguish the two biotypes. Visible and non-visible seed differences can offer effective means to distinguish the two biotypes. Seed quality of camelina is crucial. Sowing in September until the first week of October had similar seed yield. Morphological differences in the upper most developed leaves of camelina seedling can be …