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Und Today: January 2018, University Of North Dakota

UND Today Archive

No abstract provided.

Vol. 43, No. 4: Holiday 2018, School Of Medicine & Health Sciences

North Dakota Medicine Archive

No abstract provided.

Physicochemical And Thermal Effects Of Pendant Groups, Spatial Linkages And Bridging Groups On The Formation And Processing Of Polyimides, Maram A. Q. Al-Sayaghi, Jeremy Lewis, Chris Buelke, Ali Alshami

Chemical Engineering Faculty Publications

Aromatic polyimides are known for their remarkable thermal and chemical properties which are greatly influenced by their precursors. In this study, we report synthesis and characterization of four different aromatic polyimides. The four different dianhydrides (ODPA, BTDA, BPDA and PMDA) were reacted with a diamine (BisAPAF) via azeotropic imidization under same conditions. FTIR analysis confirmed the formation of aromatic polyimides and all but one polyimide (HPIBPDA) were found to be completely soluble in common solvents. The obtained molecular weights were between 16,000-32,000 Da, glass transition temperatures were between 250-275°C, degradation temperatures were above 550°C and the d-spacing values were around …

Chimera In The Library: A Journey Through The Cultures Of It, Libraries, & Library It, Stephanie Walker

Librarian Publications

No abstract provided.

Swat Modeling Of Non-Point Source Pollution In Depression-Dominated Basins Under Varying Hydroclimatic Conditions, Mohsen Tahmasebi Nasab, Kendall Grimm, Mohammad Hadi Bazrkar, Lan Zeng, Afshin Shabani, Xiaodong Zhang, Xuefeng Chu

Earth System Science and Policy Faculty Publications

Non-point source (NPS) pollution from agricultural lands is the leading cause of various water quality problems across the United States. Particularly, surface depressions often alter the releasing patterns of NPS pollutants into the environment. However, most commonly-used hydrologic models may not be applicable to such depression-dominated regions. The objective of this study is to improve water quantity/quality modeling and its calibration for depression-dominated basins under wet and dry hydroclimatic conditions. Specifically, the Soil and Water Assessment Tool (SWAT) was applied for hydrologic and water quality modeling in the Red River of the North Basin (RRB). Surface depressions across the RRB …

G-Code Modeling For 3d Printer Quality Assessment, Tyler Welander, Ronald Marsh, Md Nurul Amin

Computer Science Faculty Publications

The Department of Computer Science at the University of North Dakota (UND) has been evaluating optical/imaging methods for measuring the quality of 3D printed parts. In particular, we are interested in optical/imaging methods that can detect and measure such quality issues as layer shifting, layer separation and splitting, overheating, dimensional accuracy, and infill errors. This paper describes our work towards the analysis of infill errors as the quality of the infill does impact the structural integrity of the part being made. Externally, a part may look acceptable, but if the infill is faulty the part may be structurally unsound. Furthermore, …

Pedagogical Benefits From An Exercise In Reverse Engineering For An Aviation Software Systems, Emanuel S. Grant, Pann Ajjimaporn

Computer Science Faculty Publications

Since the Y2K crisis, reverse engineering has become a major area of work in industrial software application development, but lacks emphasis in US academia. This issue is exemplified by the high demand for software systems in new and expanding software application areas, which has resulted in systems being implemented before the requirements and design phases have been completed. Towards the maintenance of such systems, it is necessary to conducted reverse engineering for the derivation of software documentation for requirements and high-level and low-level design. When this scenario exists in the domain of safety-critical system, particularly in the aviation industry, reverse …

Design And Analysis Of Class Ef2 Inverter For Driving Transmitting Printed Spiral Coil, Mohammad Haerinia, Ebrahim S. Afjei

Electrical Engineering Student Publications

This paper studies a high frequency inverter for low power applications at a short distance. Class 𝐸𝐹2 inverter is selected and designed as a transmitting driver. A printed spiral coil is designed as a transmitting coil and is connected to the high frequency inverter. Experimental results are obtained to compare with simulation results. The experiment and simulation are in good agreement and the circuit design is verified. Operating frequency is 2.75 MHz. Maximum flux density is generated by transmitting coil is measured 149uT.

Modeling And Simulation Of Inductive-Based Wireless Power Transmission Systems, Mohammad Haerinia

Electrical Engineering Student Publications

This chapter studies an inductive-based wireless power transfer system for low-power applications at short distances. The transferring power system has been modeled, simulated and analyzed via finite element method. A wireless power transfer system includes important parts such as coil, core and driver. In this chapter, the important parts of an inductive power transfer system have been analyzed. Receiving and transmitting printed spiral coils are designed in an optimized procedure. The experimental results were in a good agreement with the simulation results. Moreover, based on the performed modulation and simulation the use of the pot core as the receiving core …

Black Snake On The Periphery: The Dakota Access Pipeline And Tribal Jurisdictional Sovereignty, Andrew Rome

North Dakota Law Review

No abstract provided.

Investigating The Impact Of Offset Fracture Hits Using Rate Transient Analysis In The Bakken And Three Forks Formation, Divide County, North Dakota, Cody Lee Brown

Theses and Dissertations

The common development plan for operators in the Williston Basin has been to initially drill and complete one well in order to hold a 1280 acre spacing unit. Once acreage is secure across the asset, operators return to each spacing unit and drill infill wells. By the time infill wells are drilled, reservoir depletion from the original (parent) well can be observed within the spacing unit. Reservoir depletion increases the likelihood of existing wells experiencing inter- communication when infill wells are hydraulically fractured. Such inter-well communication, or frac-hits, often have detrimental effects on existing wells. As such, understanding the effect …

Investigation Of Multi-Criteria Clustering Techniques For Smart Grid Datasets, Mitch J. Campion

Theses and Dissertations

The processing of data arising from connected smart grid technology is an important area of research for the next generation power system. The volume of data allows for increased awareness and efficiency of operation but poses challenges for analyzing the data and turning it into meaningful information. This thesis showcases the utility of clustering algorithms applied to three separate smart-grid data sets and analyzes their ability to improve awareness and operational efficiency.

Hierarchical clustering for anomaly detection in phasor measurement unit (PMU) datasets is identified as an appropriate method for fault and anomaly detection. It showed an increase in anomaly …

Interfacing The Cfd Code Mfix With The Petsc Linear Solver Library To Achieve Reduced Computation Times, Lauren Clarke

Theses and Dissertations

A computational bottleneck during the solution to multiphase formulations of the incompressible Navier-Stokes equations is often during the implicit solution of the pressure-correction equation that results from operator-splitting methods. Since density is a coefficient in the pressure-correction equation, large variations or discontinuities among the phase densities greatly increase the condition number of the pressure-correction matrix and impede the convergence of iterative methods employed in its solution. To alleviate this shortcoming, the open-source multiphase code MFiX is interfaced with the linear solver library PETSc. Through an appropriate mapping of matrix and vector data structures between the two software, the access to …

The Long-Term Significance Of Working As An Undergraduate Teaching Assistant, Christopher J. Felege

Theses and Dissertations

The use of undergraduate teaching assistants (UTAs) has increased in recent years at a number of institutions, especially in active-learning and high-enrollment introductory courses. Currently, there is research demonstrating their benefit to students, and the short-term impacts of the experience on the UTAs. However, no study to date has investigated the long-term impacts of the UTA experience on the participants themselves, and a number of studies call for such an investigation. This dissertation sought to fill that gap in understanding by utilizing a Grounded Theory approach to investigate the perceptions of participants who had served as an UTA in the …

Wireless Power Transfer For Biomedical Applications, Reem Shadid

Theses and Dissertations

In this research wireless power transfer using near-field inductive coupling is studied and investigated. The focus is on delivering power to implantable biomedical devices.

The objective of this research is to optimize the size and performance of the implanted wireless biomedical sensors by: (1) proposing a hybrid multiband communication system for implantable devices that combines wireless communication link and power transfer, and (2) optimizing the wireless power delivery system. Wireless data and power links are necessary for many implanted biomedical devices such as biosensors, neural recording and stimulation devices, and drug delivery and monitoring systems.

The contributions from this research …

A Study Of The Sensitivity Of Solar Power Generation To Varying Weather Conditions, Nathan Smith

Theses and Dissertations

Solar energy has seen ever-increasing implementation as a power source throughout the world since its introduction into the energy production market. Meteorological parameters including temperature, wind speed and albedo can have significant impacts on the amount of power that is produced at a utility-scale solar farm. This study sought to review the sensitivity of solar energy production to these varying weather parameters. The modeled sensitivity was tested by running simulations using modified weather data and comparing the power output to a baseline simulation. Results show that temperature has a significant effect in the efficiency of the solar panels, and by …

A Study Of Two-Phase Flow Through Static Mixers And Their Effects On Downstream Pressure Behavior, Adam A. Stoker

Theses and Dissertations

The following thesis entails the research relating to single and two-phase flow through various static mixer geometries and the measurement of fluid viscosity, viscous behavior, and density. Previous studies on the effects of static mixers on flow behavior, and the determination of fluid properties have been examined and summarized. Fluid viscosity and viscous behavior was measured using a rheometer that determined the shear stress on the fluid with a range of spindle shear rates from 0 to 250 1/s and a temperature range of 5 to 35 degrees Celsius. The results validated the fluid viscosities and the viscous behavior as …

Novel Bio-Kinetic Modeling And 2,3-Butanediol Productivity Optimization Of Clostridium Autoethanogenum, Timothy Taylor

Theses and Dissertations

The objective of this work is to elucidate the viable significance and technological implications for the fermentative production of 2,3-BDO from syngas by researching the following: derivation of a novel bio-kinetic model with substrate inhibition, analyzing product formation with the use of syngas from coal, and conducting an experimental design for potential significant factors that affect product formation. A critical review and analysis of the state-of-the-art developments for gas to liquid (GTL) technologies and syngas formation from coal are provided.

The Impact Of Stellar Convection Criteria On Population Iii Supernovae Nucleosynthesis, Jacob Teffs

Theses and Dissertations

Population III stars are the first stars formed after the Big Bang, comprised of primarily

hydrogen and helium and lack heavy elements from previous generations. Using the

one-dimensional radiation-hydrodynamics code BOOM, a grid of eighteen stellar models

with masses of 15-80 solar masses , are exploded under a low and high explosion energy criteria.

Three types of central compact remnants are considered. The 3208 isotope TORCH nuclear

reaction network is used to calculate the nucleosynthesis that occurs during the

supernovae. The two convection criteria, Ledoux and Scharzschild, produce vastly

different stellar structures and thus produce different nucleosynthetic trends. When

comparing …

Educational Technology Integration Among Community College Instructors, Oybek Turayev

Theses and Dissertations

Over the last two decades, educational technology (ET) integration has become an increasingly important aspect of higher education, particularly with the growth of online, distance and hybrid courses and degree programs. Furthermore, accrediting agencies such as the Higher Learning Commission (HLC) are paying close attention to online and hybrid courses and degree programs, making effective use of ET even more important to colleges and universities. Even in traditional, on-campus classrooms, some instructors are not using ET effectively to augment teaching and learning.

The main purpose of this research study was to examine a holistic view of educational technology integration into …

An Investigation Of Particulate Matter Air Pollution Using Caliop Observations, Travis Toth

Theses and Dissertations

Particulate matter with aerodynamic diameters smaller than 2.5 µm (PM2.5) contributes greatly to air pollution and poses significant threats to human health. Space-borne passive aerosol measurements, with their large spatial coverage, have been applied for estimating surface-based PM2.5 concentrations. Specifically, column-integrated aerosol optical thickness (AOT) observations, like those from the National Aeronautics and Space Administration (NASA) Moderate Resolution Imaging Spectroradiometer (MODIS) and Multi-angle Imaging Spectroradiometer (MISR) instruments, have been leveraged for this task. In this doctoral research study, the issues and limitations with estimating PM2.5 from passively-retrieved MODIS and MISR AOT over the contiguous United States (CONUS) were first explored. …

Mechanisms Of Cold Region Hydrologic Changes To Recent Wetting In A Terminal Lake Basin, Diane Frances Van Hoy

Theses and Dissertations

The recent changes in hydroclimatic conditions in the Northern Great Plains (NGP) have led to an increase in precipitation and wetland connectivity over the last few decades. The most recent wet period started at 2005 after the last NGP drought (1999-2004). The current wetting is expected to continue and could potentially last into 2038 and beyond. The increases in precipitation during the recent wet period yield an integrated response resulting in hydrologic changes in the NGP. However, the underlying mechanism of the hydrologic changes caused by recent wetting is poorly understood requiring a physically-based modeling framework in order to decipher …

Assessment Of Blood Pressure Regulatory Controls To Detect Hypovolemia And Orthostatic Intolerance, Ajay Kumar Verma

Theses and Dissertations

Regulation of blood pressure is vital for maintaining organ perfusion and homeostasis. A significant decline in arterial blood pressure could lead to fainting and hypovolemic shock. In contrast to young and healthy, people with impaired autonomic control due to aging or disease find regulating blood pressure rather demanding during orthostatic challenge. This thesis performed an assessment of blood pressure regulatory controls during orthostatic challenge via traditional as well as novel approaches with two distinct applications 1) to design a robust automated system for early identification of hypovolemia and 2) to assess orthostatic tolerance in humans. In chapter 3, moderate intensity …

Effect Of Nanopolymer Modified Binder On Hot Mix Asphalt, Gus Yazdani

Theses and Dissertations

There are some distresses in asphalt pavements such as high temperature permanent deformation (rutting), low-temperature (thermal) cracking, and load-associated fatigue cracking.

Rutting is caused by the accumulated plastic deformation (flow) in the asphalt mixture with repeated application of loads at upper pavement service temperatures. It is predominantly influenced by the aggregate and mix design. Modifiers can stiffen the binder and provide a more elastic material.

Thermal shrinkage cracking results from either a single thermal cycle where the temperature reaches a critical low temperature (Single Event Thermal Cracking) or from thermal cycling above the critical low temperature (Thermal Fatigue).

In this …

Seismic Analysis Of Wind Turbines, Sam Austin

Theses and Dissertations

The goal of this research is to add additional data to an expanding body of knowledge in the field of seismic engineering of wind turbines through a series of numerical analyses and also comparing them to current guidelines. This data can be used to further study the dynamic behavior of wind turbines under seismic loads and also provides answers to some of the questions in this field. This is important considering the expansion of wind farms into seismically active regions, increasing size of wind turbines, and lack of specific guidelines for seismic design of wind turbines. This research also emphasizes …

Intergenerational Perspectives On Leadership By Men Of The Three Affiliated Tribes, Chad Beldon Dahlen

Theses and Dissertations

The purpose of this qualitative study was to examine perceptions of leadership and education held by three father-son pairs of Native American Three Affiliated Tribes members. Two father-son pairs with one triad of grandfather, father and son have all graduated from college and are considered leaders by their peers or have accomplished significant achievements, and are recognized by their community. Portraiture was used as a methodological framework for this project. Qualitative data were collected using interviews, observations, and formal and informal visits. Document analysis was used to describe and analyze how these Native fathers and sons were able to navigate …

Scale-Up Feasibility And Novel Method Of Separation Of Carbon From An Oxygen Carrier, Nicholas A. Dyrstad-Cincotta

Theses and Dissertations

This project targets the development of a technology for segregating fuel-based contaminants (char/carbon) from oxygen carrier material in the context of chemical looping combustion applications. In chemical looping, the well-mixed solids that flow from the fuel reactor consisting of char, ash, and oxygen carrier particles cannot be completely separated into their constituents before they enter the air reactor. The slip of carbon leads to char oxidation in the wrong reactor and poor carbon dioxide separation efficiency. The buildup of ash that is not rejected necessitates rejection of larger quantities of oxygen carrier material, resulting in a high operating cost penalty. …

A Mixed Method Study Of The Impact Of Advanced Placement, International Baccalaureate, And Dual Enrollment Courses On College Transition And Success, Kazimir Bartley Gazdzik

Theses and Dissertations

In an educational environment that has limited resources, and greater pressures for increased academic standards, what is the best option to help prepare high school students for college academics? This research study: A Mixed Method Study of the Impact of Advanced Placement, International Baccalaureate, and Dual Enrollment Courses on College Transition and Success attempted to investigate the impact of advanced courses on college transition.

The results of this research showed no statistical difference in academic success or transition to college between students who had taken advanced classes and those who had not. There were also no statistical differences between students …

Synthesis And Characterization Of Novel Bioplastics By Innovative 3d Printing Approaches, Kathryn Marie Hall

Theses and Dissertations

This work describes the synthesis and characterization of novel bioplastic composites by using novel additive manufacturing (AM) approaches. As a background, global plastic consumption has become a problem with the accumulation of plastics in landfills and the ocean. Recently, bioplastics have emerged as a viable option to petrochemicals. Currently, there are some issues like biodegradability, property optimization with bioplastics etc. In thesis, novel methods and engineering of composition of bioplastics are being reported. In Chapter II, the addition of lignin to the PLA polymer matrix by using solvent mixing will be reported. During this study, liquid ink mixture was successfully …

Autonomous Localization Of A Uav In A 3d Cad Model, Akkas Haque

Theses and Dissertations

This thesis presents a novel method of indoor localization and autonomous navigation of Unmanned Aerial Vehicles(UAVs) within a building, given a prebuilt Computer Aided Design(CAD) model of the building. The proposed system is novel in that it leverages the support of machine learning and traditional computer vision techniques to provide a robust method of localizing and navigating a drone autonomously in indoor and GPS denied environments leveraging preexisting knowledge of the environment. The goal of this work is to devise a method to enable a UAV to deduce its current pose within a CAD model that is fast and accurate …