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Articles 541 - 570 of 11644
Full-Text Articles in Entire DC Network
Electrochemical Investigation Of Moisture Byproducts In Molten Calcium Chloride, Rankin Shum, Marah Gragun, Tyler Williams, Devin Rappleye
Electrochemical Investigation Of Moisture Byproducts In Molten Calcium Chloride, Rankin Shum, Marah Gragun, Tyler Williams, Devin Rappleye
Faculty Publications
Residual water in molten CaCl2 reacts to form different byproducts, such as HCl, which can impact the corrosivity of the salt and efficiency of electrochemical operations, such as electrolytic oxide reduction and electrorefining. The ability to detect and quantify these byproducts electrochemically can provide feedback on the efficacy of vacuum drying and other purification methods, as well as the impact of these byproducts on process operations. An electrochemical signal’s association with the production of H2 is verified and characterized using cyclic voltammetry (CV) and residual gas analysis. CV estimated a 2-electron exchange process associated with H2 production. CV …
Model Predictive Control Of A Grid-Scale Thermal Energy Storage System In Relap5-3d, Jaron Wallace, John Hedengren, Kody Powell, Matthew Memmott
Model Predictive Control Of A Grid-Scale Thermal Energy Storage System In Relap5-3d, Jaron Wallace, John Hedengren, Kody Powell, Matthew Memmott
Faculty Publications
This research delves into the integration and control of a Thermal Energy Storage (TES) system with a Small Modular Reactor (SMR), specifically the NuScale VOYGR SMR module in RELAP5-3D. The research methodology centered on modeling the NuScale VOYGR SMR, a light water pressurized water reactor (LWR) with a power output capacity of 77 MWe per module. The reactor and plant details were sourced from NuScale's final safety analysis report and supplemented by information from the NuScale website. The SMR plays a crucial role in energy generation, and to manage and dispatch the produced energy effectively, a robust storage system …
Cognosis And The Evolution Of Civilization, Ken Baskin
Cognosis And The Evolution Of Civilization, Ken Baskin
Comparative Civilizations Review
From the time when the complex states such as Egypt or Sumer emerged roughly 5,000 years ago, the civilizations they represent have generally become more populous, more socially varied, wealthier, and more technologically advanced. As a result, the innovations they produced would begin to change the conditions in which they existed, and their cultures have had to evolve to adapt to this ongoing change. For instance, the cultures of Bronze Age Egypt and the Iron Age Han Dynasty had to be quite different, even though both were agricultural societies. And, of course, the Electronic Age cultures of the United States …
Seventeen Crises In Western Civilization That Have Arisen Since The Dark Ages: A Cognition Science-Oriented Approach, Andrew Targowski
Seventeen Crises In Western Civilization That Have Arisen Since The Dark Ages: A Cognition Science-Oriented Approach, Andrew Targowski
Comparative Civilizations Review
The purpose of this article is to synthesize those crises in the unfolding of Western civilization that are controlled by human knowledge and wisdom. The methodology is transdisciplinary, utilizing a cognitive science-oriented, big-picture view of civilization and main conflicts. The crises are investigated across three time periods; the Dark Ages (from the fifth to the fourteenth century), Modern Times (from the fifteenth to the twentieth century), and the present century. The findings reveal that today Western civilization faces seventeen significant crises. Knowledge is not sufficient to solve these crises; we need to employ knowledge-based wisdom. This approach presents a new …
The Geographic Clash Of Civilizations?, Mojtaba Sadeghi
The Geographic Clash Of Civilizations?, Mojtaba Sadeghi
Comparative Civilizations Review
The Geographic Clash of Civilizations represents a significant geographic-civilizational reality and process, a phenomenon that has occurred and is expected to unfold increasingly in the third millennium. Understanding, analyzing, and forecasting this phenomenon relies solely on the geographic conceptualization of civilization. Through that perspective, the world is undergoing another instance of the geographic clash of civilizations, a clash more profound than the Clash of Civilizations, impacting the survival or collapse of human civilizations. The geographic clash of civilizations epitomizes an inescapable conflict between the soul (das-man) and the body (no-da-sein) of a civilization, stemming from …
Unrest On The Eurasian Landmass Since 1917, Bertil Haggman
Unrest On The Eurasian Landmass Since 1917, Bertil Haggman
Comparative Civilizations Review
The terrorist attacks on the United States on September 11, 2001, and the subsequent war on global terrorism and its networks reminded the world of the danger to civilization of worldwide criminal enterprises. The purpose of these notes is to present some introductory material on the ongoing planetary civil war since 1917. The training for worldwide revolutionary war started at Soviet Russian political warfare academies shortly after the Russian Revolution. During the 1990s, similarly, terrorists have been undergoing terrorism training. Thousands of terrorists have graduated from terrorist schools and have been active in around 60 countries worldwide.
Book Review: Arabia Felix: From The Time Of The Queen Of Sheba (Eighth Century B.C. To The First Century A. D.), Tseggai Isaac
Book Review: Arabia Felix: From The Time Of The Queen Of Sheba (Eighth Century B.C. To The First Century A. D.), Tseggai Isaac
Comparative Civilizations Review
Arabia Felix is a book about Sheba, “modern Yemen” with added highlights on the broader region of Arabia. The author gives an in-depth analysis on how Arabia captured the attention of ancient empires. Arabia also conducted rich trade with her contemporary civilizations such as the Egyptians, Assyrians, and Persians who “encountered caravans of aromatic products coming from South Arabia.”
Analysis Of Isotopic Effects On Hydrogen Oxidation, Jacob Carter Wilde
Analysis Of Isotopic Effects On Hydrogen Oxidation, Jacob Carter Wilde
Theses and Dissertations
Tritium generation presents a significant hazard during operation of nuclear reactors and necessitates safety precautions in the case of a combustion incident. Accurate kinetic models should inform these safety precautions, however, reliable tritium data do not exist to generate such models. This work focuses on laminar flame speed, which is an important component of kinetic models. Current estimates based on established kinetic theories and experimental measurements of the other isotopes of hydrogen predict tritium to have a flame speed approximately 70% that of standard protium over a broad range of stoichiometries at one atmosphere in air. These estimates are based …
Economic Impact Considerations For Sustainable Design Engineering As Derived From The Literature, K. Joshua Kelley, Christopher A. Mattson, Nile Hatch, John L. Salmon
Economic Impact Considerations For Sustainable Design Engineering As Derived From The Literature, K. Joshua Kelley, Christopher A. Mattson, Nile Hatch, John L. Salmon
Undergraduate Honors Theses
This thesis contributes to the scholarship on sustainable development by presenting a review of the literature on the economic impacts of engineering design decisions and engineered products. Many design engineers already consider the economic impacts of their work, especially those impacts related to production cost and the economic feasibility of their products. However, we believe that a review of our findings can help design engineers consider a more comprehensive set of economic impacts that apply to their work, leading to greater sustainability. Presented in this thesis are 11 economic impact categories, spanning three economic scopes.
Enhancing Surface Texturing Of Zirconia Toughened Alumina Ceramic Through Optimized Electric Discharge Machining Utilizing The Assistive Electrode Method, Yazan Eyas Tuffaha
Enhancing Surface Texturing Of Zirconia Toughened Alumina Ceramic Through Optimized Electric Discharge Machining Utilizing The Assistive Electrode Method, Yazan Eyas Tuffaha
Theses and Dissertations
Zirconia toughened alumina (ZTA) is a durable and biocompatible ceramic material commonly used in prosthetic hip implants because of its excellent mechanical properties and wear/corrosion resistance. Surface texturing can improve the lubricity and longevity of hip implant bearing surfaces, but precision machining of ceramic materials such as ZTA is very difficult due to suboptimal surface integrity results of traditional machining techniques. This thesis explores the optimization of machining ZTA using electric discharge machining (EDM) - a process usually reserved for conductive metals - to machine holes into the ceramic to create surface textures. EDM is made possible through the assistive …
Reconstructing Visual Narratives: Mary Colter, Fred Kabotie, And The Myth Of The West At Desert View Watchtower, Allison M. Foster
Reconstructing Visual Narratives: Mary Colter, Fred Kabotie, And The Myth Of The West At Desert View Watchtower, Allison M. Foster
Theses and Dissertations
Desert View Watchtower opened in 1933 on the Grand Canyon South Rim, under the management of the Fred Harvey Company. The structure contains many self-contradictions, in terms of style and use. In this thesis, I argue that these contradictions come from the dichotomous motives of Desert View Watchtower's architect, Mary Colter, and her employers, the Fred Harvey Company and the Atchison, Topeka & Santa Fe Railway. New western history theory of the Mythical West is used to explain Harvey/Santa Fe marketing, which created a narrative suggesting that Native American lifeways were going to disappear from the Southwest. I argue that …
Feature Engineering For Grain Boundaries And Other Variable-Sized Atom Clusters, C. Braxton Owens
Feature Engineering For Grain Boundaries And Other Variable-Sized Atom Clusters, C. Braxton Owens
Theses and Dissertations
Obtaining microscopic structure-property relationships for grain boundaries are challenging because of the complex atomic structures that underlie their behavior. This has led to recent efforts to obtain these relationships with machine learning, but representing a grain boundary structure in a manner suitable for machine learning is not a trivial task. There are three key steps common to property prediction in grain boundaries and other variable-sized atom clustered structures. These are: (1) describe the atomic structure as a feature matrix, (2) transform the variable-sized feature matrices of different structures to a fixed length common to all structures, and (3) apply machine …
Fission Product Thermodynamics, Solubility, And Extraction In Molten Salts And Lead, Richard Lee Fitzhugh
Fission Product Thermodynamics, Solubility, And Extraction In Molten Salts And Lead, Richard Lee Fitzhugh
Theses and Dissertations
Chemical behavior of fission products in systems relevant to two major advanced nuclear reactor systems, namely the lead-cooled fast reactor (LFR) and molten-salt reactor (MSR), has been studied with a heavy emphasis on thermodynamics. The behavior of fission products in molten salts is examined from a theoretical perspective, with an emphasis on the standard state used to define the thermodynamic activity. A standard state extrapolated from infinite dilution behavior, which is fairly common practice in electrochemistry, is found to facilitate faster, easier, and simpler analysis while retaining much of the accuracy of the complex Modified Quasichemical Model. Inductively-coupled plasma mass …
Void Formation During Liquid Composite Molding Under Varied Pressure With Mechanical Properties Validation, Neil Russell Thompson
Void Formation During Liquid Composite Molding Under Varied Pressure With Mechanical Properties Validation, Neil Russell Thompson
Theses and Dissertations
Composite materials have revolutionized products and how they are manufactured. Most large-scale aerospace companies utilize a carbon fiber pre-impregnated with a resin in conjunction with an autoclave to minimize voids, but it is very expensive and requires a great amount of space. The less expensive alternative to prepreg-autoclave processes is known as Liquid Composite Molding (LCM), in which the resin is brought into a mold via overpressure on the resin supply or by a vacuum in the mold. But this process is more prone to voids due to bubble formation. Voids are a critical issue as common failure modes such …
Deep Learning For Source Localization In A Laboratory Tank, Corey Emerson Dobbs
Deep Learning For Source Localization In A Laboratory Tank, Corey Emerson Dobbs
Theses and Dissertations
Deep learning has been applied to underwater acoustics problems in many forms. One difficulty in applying deep learning techniques to ocean acoustics is the spatially and temporally varying environmental properties. Another challenge is the lack of labeled data for training large networks. The overall goal of this work is to develop deep learning approaches for source localization that can be adaptable to different conditions. In this work, a convolutional neural network was trained on acoustic data measured in a water tank, while the water was at room temperature, to predict source-receiver range. Tests were done to ascertain ideal quantities of …
Emergent Leadership, L2 Oral Proficiency, And Social Networks During Study Abroad, Nicole C. Whitby
Emergent Leadership, L2 Oral Proficiency, And Social Networks During Study Abroad, Nicole C. Whitby
Theses and Dissertations
Research shows that study abroad (SA) provides a unique, yet varied outcome for students seeking to improve their target language oral proficiency during study abroad SA (Freed et al., 2004). Contemporary work in second language acquisition (SLA) during SA has looked beyond individual behaviors of sojourners to analyze social networks as a structure with significant influence on outcomes, yet emergent leadership has not been addressed within social network analysis in SA. To address this gap the current study employed a computational social network approach. This mixed methods study analyzes the social networks of 30 SA sojourners from a large private …
Linking Geospatial Trends And Geochemical Fingerprints To Anthropogenic Phosphorus Dust Deposition In Subalpine Soils, Austen Michael Lambert
Linking Geospatial Trends And Geochemical Fingerprints To Anthropogenic Phosphorus Dust Deposition In Subalpine Soils, Austen Michael Lambert
Theses and Dissertations
This study shows that fugitive emissions associated with the surface mining of phosphate rock are a significant phosphorus (P) source to surface soils in northeastern Utah. Phosphorus is a nonrenewable resource essential for all life. Anthropogenic alterations to the P-cycle have led to widespread P pollution, and the unsustainable management of P has led to the threat of global depletion of P resources. Thus, accounting for both natural and anthropogenic flow paths of P is essential for the conservation and pollution reduction of P. One such source of human alteration to the P-cycle is the mining of phosphate rock. Mining, …
Microbial Hydrolysis Process To Improve Anaerobic Digestion For Biofuel Generation, Caleb Michael Jensen
Microbial Hydrolysis Process To Improve Anaerobic Digestion For Biofuel Generation, Caleb Michael Jensen
Theses and Dissertations
Human development results in billions of tons of waste per year, which contributes to major issues such as pollution, climate change, and habitat destruction. In this study, we explored the impact of bacterial inoculation on volatile fatty acid (VFA) production, volatile solids (VS), and gas output in anaerobic digesters under different substrate treatments. Our results reveal that bacterial inoculation significantly boosts VFA levels, especially acetic acid, with both Caldicellulosiruptor bescii and mixed Caldicellulosiruptor, cultures showing notable differences compared to controls, especially in untreated manure and WAS treatments. Acetic acid and VS/TS increased in untreated WAS when inoculated with C. bescii …
The Cofactor Matrix For Optimized Normal Transformations & Real-Time Caustics And Refractions Using Signed Distance Fields, Dane William Christensen
The Cofactor Matrix For Optimized Normal Transformations & Real-Time Caustics And Refractions Using Signed Distance Fields, Dane William Christensen
Theses and Dissertations
This thesis contains two distinct manuscripts both focused on real-time rendering research; an abstract for each is provided: 1. We survey methods for mapping normal vectors to a transformed surface with emphasis on the cofactor matrix form. We demonstrate that the cofactor matrix uniquely and correctly supports matrix transformations that are rank deficient or have negative determinants, while also generalizing to operations such as rotation, scaling, translation, and shearing. We derive and demonstrate the completeness of this new convention in contrast to other approaches, while also establishing its computational efficiency benefits. 2. We present SDF volumes as an efficient datastructure …
Quiescent Condensation Heat Transfer On Vertical Cicnt Structured Superhydrophobic Surfaces, Clint Mach Hubbard
Quiescent Condensation Heat Transfer On Vertical Cicnt Structured Superhydrophobic Surfaces, Clint Mach Hubbard
Theses and Dissertations
This study experimentally investigates the impact of the subcooling magnitude, the carbon-infiltrated carbon nanotube (CICNT) diameter, the time duration of condensation, and amount of non-condensable gases on the nature of dropwise condensation and condensate removal, and heat flux and heat transfer coefficient measurements. Experiments were conducted in a vacuum chamber on a vertically oriented test CICNT surface. The CICNT diameter was varied between 15-120 nm and the subcooling ranged from 0.5-9 °C. Each test ran for a duration of at least one hour and video was recorded at 20-minute intervals. Three modes of condensation were observed: drop jumping, drop wetting …
Behavior Of Reinforced Lightweight Cellular Concrete Backfill For Mechanically Stabilized Earth Walls With Welded Wire Reinforcements, Cole Max Larsen
Behavior Of Reinforced Lightweight Cellular Concrete Backfill For Mechanically Stabilized Earth Walls With Welded Wire Reinforcements, Cole Max Larsen
Theses and Dissertations
Lightweight cellular concrete (LCC) consists of a mixture of cement, water, and a pre-formed foam. The pre-formed foam entrains a high proportion of air voids into the cement water slurry at the time of casting, decreasing the product's overall weight. LCC is also a viable alternative when low native soil strengths prevent the use of traditional backfill methods through mitigating settlement and increasing strength. Due to these benefits, the use of LCC behind mechanically stabilized earth (MSE) walls is gaining popularity. Despite LCC gaining popularity behind MSE walls, the exact nature of the failure envelope is poorly understood. The pullout …
A Comparative Analysis Of Human And Machine Translation Quality, Catherine Marshall
A Comparative Analysis Of Human And Machine Translation Quality, Catherine Marshall
Theses and Dissertations
A common question raised by both translators and Machine Translation developers is Will Machine Translation (MT) ever attain the level of Human Translation (HT) quality? Researchers have argued that MT will likely never replace HT completely because MT systems cannot anticipate all the specifications for possible translation projects (Melby & Hague, 2019) and because MT systems lack cultural understanding (Latief et al., 2020). Researchers have also argued that the use of machines should be focused on augmenting humans, rather than trying to imitate them (Brynjolfsson, 2022). The purpose of this study is to determine how the quality of MT differs …
Tools For Planning Multi-Axis Vibration Qualification Tests, Marcus Edward Behling
Tools For Planning Multi-Axis Vibration Qualification Tests, Marcus Edward Behling
Theses and Dissertations
Vibration qualification testing is necessary to ensure that components will endure vibration-induced damage in flight. Multi-axis tests have shown the potential for improvement over single-axis tests, though they require increased planning. This work focuses on planning three critical aspects of these tests: the amount of operational next assembly to include in the test, the size of shakers to use, and the number of shakers to use. Next assembly selection is studied by varying the amount of next assembly included in the lab test, performing physical tests, and comparing the accuracy of environment reconstruction in each test. In doing so, a …
Design For Pullout Resistance And Global Stability Of Metallic Reinforcements In Mse Walls With Lightweight Cellular Concrete Backfill, Joshua Curt Peterson
Design For Pullout Resistance And Global Stability Of Metallic Reinforcements In Mse Walls With Lightweight Cellular Concrete Backfill, Joshua Curt Peterson
Theses and Dissertations
Lightweight cellular concrete (LCC) is a type of concrete that has reduced density and weight compared to traditional concrete. This is achieved by incorporating a large amount of air- filled cells or voids into the mixture. The resulting material is lighter, yet still possesses considerable strength and durability, making it suitable for a range of construction applications, especially in the case of retaining walls because of its reduced weight. Unlike traditional concrete, which can be extremely heavy and place significant stress on the supporting structure, lightweight cellular concrete reduces the pressure on the retaining wall, helping to prevent deformation and …
Demand Side Management Through Integrated Water Distribution Systems And Smart Irrigation Controllers, Nathan T. Lunstad
Demand Side Management Through Integrated Water Distribution Systems And Smart Irrigation Controllers, Nathan T. Lunstad
Theses and Dissertations
The innovation of electrical utilities in creating smart electrical grids has superseded that of water utilities in analogous efforts. While many water utilities are now using smart water technologies, they lack the virtual command center that allows for two-way communication for more effective forecasting, load balancing, preventive methods, emergency and master planning, and level of service delivery while ensuring environmental justice and enhancing the responsible use of resources. In this dissertation, I propose the idea of the Integrated Water Distribution System (IWDS) to overcome this challenge. IWDS coordinates management of water supply and demand in a way that benefits both …
Exploring Co-Manipulation Via A New Decomposition Of Interaction Force And An Exploration Of Signal Space In Multi-Agent Motion Primitives, Kody Blaine Shaw
Exploring Co-Manipulation Via A New Decomposition Of Interaction Force And An Exploration Of Signal Space In Multi-Agent Motion Primitives, Kody Blaine Shaw
Theses and Dissertations
Co-manipulation is when two or more people work together to move an object. In this work, we consider the physical co-manipulation of objects that are large and heavy enough that they are more easily handled by two or more participants. We currently lack a fundamental understanding of how people perform such tasks together, both the basic signals they use to communicate and how those signals are mapped to actions and behaviors. This work builds upon the existing body of knowledge to improve our understanding of physical co-manipulation. Specifically, interaction forces are often considered a key method for information transfer in …
Tribological Analysis Of Heat Treatments On Medical Grade Cobalt Chromium Molybdenum Alloys, Samuel Edis Bowden
Tribological Analysis Of Heat Treatments On Medical Grade Cobalt Chromium Molybdenum Alloys, Samuel Edis Bowden
Theses and Dissertations
Cobalt chromium molybdenum (CoCrMo) has many material properties that make it desirable as a medical hip implant. Due to the range of heat treatments available and the resulting material properties that are present in medical device manufacturing using CoCrMo, many implants are not able to withstand both the chemical and physical wear necessary as a hip replacement. This research looks to examine various heat treatments and their resulting properties to find a desirable heat treatment for CoCrMo in hip implant bearing surfaces. This study was accomplished by using five distinct variations of heat treatment on forged CoCrMo alloy that would …
Exploring The Link Between Travel Behavior And Mental Health, Emily Kae Youngs
Exploring The Link Between Travel Behavior And Mental Health, Emily Kae Youngs
Theses and Dissertations
This study explores the critical link between travel behavior and mental health, focusing on young adults who have expressed suicidal ideation. By analyzing how daily activities and movement patterns impact mental well being, the research aims to explore travel related mental health approaches for individuals. The importance of this work lies in its potential to improve the quality of life for individuals by informing more personalized and effective mental health strategies. Through comprehensive data analysis and statistical modeling, the research aims to uncover insights into how travel behavior influences motivation levels and mental well-being across different neurological and physiological groups. …
Engineering Cell-Free Protein Synthesis Biosensors For Point Of Care Use, Tyler Jordan Free
Engineering Cell-Free Protein Synthesis Biosensors For Point Of Care Use, Tyler Jordan Free
Theses and Dissertations
Diagnostic tests can dramatically improve and save lives. Survival rates and patient outcomes related to cancer and other diseases can be improved when routine testing guides personalized treatment. Highly accurate laboratory tests exist for thousands of biomarkers, including those of interest in this dissertation, but cost and complexity limit access to life-saving lab tests in many cases throughout the world. To fill this need and increase accessibility of diagnostics, in this report we report our engineering advancements towards portable biosensors for colorimetric detection of glutamine, endocrine disrupting compounds (EDC), and pathogenic RNA which are key biomarkers in cancer treatment monitoring, …
Systematic Review Of Digital Activity Schedule Use In Individuals With Autism And Intellectual Disability, Adelaide Wahlquist Hammond
Systematic Review Of Digital Activity Schedule Use In Individuals With Autism And Intellectual Disability, Adelaide Wahlquist Hammond
Theses and Dissertations
The purpose of this systematic review of using digital activity schedules as an intervention in individuals with autism spectrum disorder and intellectual disabilities is to determine to what extent the current research shows it to be an effective intervention. For articles to be included in this review, they had to use a digitally presented activity schedule, the activity schedule could not be a task analysis of a single activity or a group visual schedule, and the intervention must have been carried out with individuals with autism or intellectual disabilities. Studies meeting the inclusion criteria totaled 17 studies with a total …