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Articles 421 - 450 of 8047
Full-Text Articles in Entire DC Network
The Impact Of Divided Attention Tasks On Stress: Insights From Heart Rate Variability And Galvanic Skin Response, Kira Stefanie Uluave
The Impact Of Divided Attention Tasks On Stress: Insights From Heart Rate Variability And Galvanic Skin Response, Kira Stefanie Uluave
Theses and Dissertations
This study examined the impact of divided attention tasks on stress using physiologic measures. The divided attention conditions included speech tasks (conversation or procedural discourse) and non-speech computer-based tasks (visuospatial, mathematical, language, data entry, or text editing). Participants included 60 adults divided into two groups of 30 by age. The young adult group ranged in age from 18-30 years and the older adults ranged from 55-82 years. Participants were required to perform the speech task and the non-speech task in isolation as well as a speech task performed concurrently with each of the non-speech tasks. The order of the tasks …
Dna-Templated Nanofabrication Of Metal-Semiconductor Heterojunctions And Their Electrical Characterization, Chao Pang
Theses and Dissertations
Bottom-up nanofabrication, although still in its early stages with formidable challenges, is considered a potential alternative method to address the limitations of traditional top-down techniques by offering benefits including process simplification, cost reduction, and environmental friendliness. DNA-templated nanofabrication, one of the most powerful bottom-up methods, presents an innovative way to create advanced nanoelectronics. In this approach, nanomaterials with specific electronic, photonic, or other functions are precisely and programmably positioned on DNA nanostructures from a disordered collection of smaller parts. These self-assembled structures offer significant potential for improving many fields such as biosensing, drug delivery and electronic device manufacturing. This dissertation …
Distributed Conflict Detection And Optimal 4d Trajectory Resolution Leveraging Polynomial Based Methods, Michael Klinefelter, Austin Stone, Joshua Miller, Cameron K. Peterson, John Salmon
Distributed Conflict Detection And Optimal 4d Trajectory Resolution Leveraging Polynomial Based Methods, Michael Klinefelter, Austin Stone, Joshua Miller, Cameron K. Peterson, John Salmon
Student Works
This paper presents a methodology for distributed conflict detection and resolution of aircraft following time-dependent flight paths. We use parametric fifth-order polynomial splines to define the full, time-based paths of vehicles. This representation can be exploited to rapidly detect conflicts and calculate optimal resolution solutions that minimize deviations from the original path. Conflicts are identified using a Sturm sequencing procedure and resolutions are found using gradient-based optimization techniques. Simulations show the locally optimal resolution of complex multi-vehicle conflicts and large-scale scenarios. Also, a method of fitting the flight path model to data sets is presented and flight path trajectories are …
Alma Mater: Implications Of Student Mothers Not Receiving "Nourishment" From Their University, Haylie M. June
Alma Mater: Implications Of Student Mothers Not Receiving "Nourishment" From Their University, Haylie M. June
Theses and Dissertations
Student mothers, comprising over one-fifth of college students, face unique challenges balancing academic pursuits with parental responsibilities. They seek higher education to improve financial prospects and set examples for their children. However, financial burdens, including childcare costs and debt, hinder their progress. Moreover, they face role conflict and societal judgment, feeling undervalued and alienated within the university community. Despite their resourcefulness, challenges persist, emphasizing the need for institutional support. Research explores how student mothers utilize social, cultural, and financial capital to manage their roles. Interviews with thirty-nine student mothers reveal heavy reliance on individual resources but underscore the need for …
Dr. John Snow And The Nineteenthcentury British Cholera Crisis, Betsy A. Maughan
Dr. John Snow And The Nineteenthcentury British Cholera Crisis, Betsy A. Maughan
The Thetean: A Student Journal for Scholarly Historical Writing
During the nineteenth century, Britain underwent attacks from a silent, determined killer. Invisible to the naked eye, this sinister enemy invaded towns, villages and homes with unforgiving stealth and cruelty. Lives were changed forever as panic, terror, and death overtook human habitats. The sneaky menace was Asiatic cholera. Although the first devastating British attack occurred during 1831-1832, London was fortunate enough to stay out of its destructive path. Luck ran out, however, as the second assault occurred during 1848-1849, consuming a good part of the city. Dr. John Snow, English physician, anesthetist and epidemiologist, dedicated most of his life to …
Manchester And The Lit And Phil, Nik Vigil
Manchester And The Lit And Phil, Nik Vigil
The Thetean: A Student Journal for Scholarly Historical Writing
In writing his extensive History, Directory, and Gazetteer of the County Palatine of Lancaster, Edward Baines wrote, "When the increase of wealth and population lead to the establishment of societies for the improvement of the mind and the extension of science, they produce their legitimate influence; of this nature is the Manchester Literary and Philosophical Society." The Lit and Phil, as it was most commonly known, was established in 1781 as a society intended for the discussion of topics as diverse as experimental chemistry and the commercial arts. The Lit and Phil was unique in that it was begun …
Spiritual Chemistry: The Theosophic Roots Of Newtonian Alchemy, Jeffery Tucker
Spiritual Chemistry: The Theosophic Roots Of Newtonian Alchemy, Jeffery Tucker
The Thetean: A Student Journal for Scholarly Historical Writing
The popularization of mathematics in the Modern Era and the subsequent proliferation of technologies have created a cultural environment in which the meaning of 'science' is often assumed to be self-evident. Philosophically, this presumptive consensus derives many of its arguments from Popperian criteria, which seek to delineate the critical differences between 'science' and 'non-science.' These demarcations imply that 'science' is an empiric reality, discoverable in both its methods and qualities. Although Kuhnian relativism has attenuated the robustness of these assertions, the fact remains that many individuals purport to have an intuitive ability to state definitively, "This is science." Such claims …
Red Boots And Lunch Bucket: Remembrances Of A Rural School, John Wolter Nielsen
Red Boots And Lunch Bucket: Remembrances Of A Rural School, John Wolter Nielsen
The Bridge
No abstract provided.
A Bilevel Approach To Resource Allocation For Utility-Based Request-Response Systems, Tanner Jack Sundwall
A Bilevel Approach To Resource Allocation For Utility-Based Request-Response Systems, Tanner Jack Sundwall
Theses and Dissertations
We present a novel bilevel programming formulation that aims to solve a resource allocation problem for request-response systems. Our formulation is motivated by potential inefficiencies in the allocation of computational resources to incoming user requests in such systems. In our experience, systems often operate with a surplus of resources despite potentially incurring unjustifiable cost. Our work attempts to optimize the tradeoff between the financial cost of resources and the opportunity cost of unfulfilled user demand. Our bilevel formulation consists of an \textit{upper} problem which has a constraint value appearing in the \textit{lower} problem. We derive efficient methods for finding global …
Enhancing Parental Support For Stem Students, Rebecca Stull Zundel
Enhancing Parental Support For Stem Students, Rebecca Stull Zundel
Instructional Psychology and Technology Graduate Student Projects
This project report explores the design and implementation of instructional resources aimed at enhancing parental support for STEM students within the Army Educational Outreach Program (AEOP). Through a human-centered approach, the project addresses the need for parental involvement in fostering students' STEM education and career exploration. Drawing on multiple design principles and theories, the project aims to empower parents with the knowledge and skills necessary to provide informed guidance and support in STEM fields. The design process involves a comprehensive analysis of learner needs, environmental factors, and project constraints, resulting in the development of self-directed resources tailored to the specific …
Dissecting Trypanosome Metabolism By Discovering Glycolytic Inhibitors, Drug Targets, And Glycosomal Ph Regulation, Daniel Hale Call
Dissecting Trypanosome Metabolism By Discovering Glycolytic Inhibitors, Drug Targets, And Glycosomal Ph Regulation, Daniel Hale Call
Theses and Dissertations
Trypanosoma brucei, the causative agent of African trypanosomiasis, and its relatives Trypanosoma cruzi and several Leishmania species belong to a class of protozoa called kinetoplastids that cause a significant health burden in tropical and semitropical countries across the world. While an improved therapy was recently approved for African trypanosomiasis, the therapies available to treat infections caused by T. cruzi and Leishmania spp. remain relatively poor. Improving our understanding of T. brucei metabolism can inform on metabolism of its relatives. The purpose of the research presented in this dissertation was to develop novel tools and methods to study metabolism in T. …
Model To Demonstrate Effects Of Mass Transfer And Applied Current In An Electrolytic Cell, George Ankrah
Model To Demonstrate Effects Of Mass Transfer And Applied Current In An Electrolytic Cell, George Ankrah
Reviews, Analyses, and Instructional Studies in Electrochemistry (RAISE)
This study investigates the relationship between applied current and resulting cell potential in an electrolytic system, considering the transport of electroactive species. By applying Michael Faraday's laws of electrolysis and the Nernst-Planck equation, the behavior of electroactive species in diffusion-controlled systems with and without stirring is modeled. The plots demonstrate how stirring enhances ion transport and establishes a stable Nernst diffusion layer, affecting the kinetics of electrochemical reactions. Understanding these dynamics is crucial for optimizing electrolysis processes.
Review Of Cyclic Voltammetry Measurements For Uranium In Flinak Molten Salt, Jackson Ivory
Review Of Cyclic Voltammetry Measurements For Uranium In Flinak Molten Salt, Jackson Ivory
Reviews, Analyses, and Instructional Studies in Electrochemistry (RAISE)
The electrochemical behavior of uranium FLiNaK molten salts is explored, focusing on cyclic voltammetry (CV) as a powerful tool for redox characterization and diffusion studies. Through a comprehensive review of recent research, the study highlights the significance of CV in understanding electrode kinetics, material compatibility, and process optimization in molten salt environments. The findings underscore the potential of FLiNaK molten salt reactors in advancing nuclear energy technologies, fuel processing, and waste management strategies. Collaborative interdisciplinary efforts are emphasized to address challenges and accelerate innovation in electrochemical methods for nuclear applications.
Model Of The Effect Of Voltage On Contact Angle In An Electrolytic Cell Reaction, Aaron Essilfie
Model Of The Effect Of Voltage On Contact Angle In An Electrolytic Cell Reaction, Aaron Essilfie
Reviews, Analyses, and Instructional Studies in Electrochemistry (RAISE)
This paper investigates the hypothesis that the contact angle at the meniscus of an electrode-electrolyte can be altered during a redox reaction through the coupled understanding of electrowetting and capillarity rise. Recent studies in electrowetting have focused on dielectric surfaces but research on contact angle at the electrode-electrolyte surface is lacking. The study employs a basic electrolytic cell. By applying principles of electrowetting and capillary rise the research aims to understand the relationship between applied voltage and contact angle, to advancements in electrochemistry and microfluidics.
An Overview Of How To Measure The Kinetic Properties Of An Anode Material For The Chlorine Evolution Reaction, Cameron Vann
An Overview Of How To Measure The Kinetic Properties Of An Anode Material For The Chlorine Evolution Reaction, Cameron Vann
Reviews, Analyses, and Instructional Studies in Electrochemistry (RAISE)
The process of generating chlorine gas using electrolysis in aqueous systems is well established. However, a new process requires chlorine to be generated at high temperatures using molten salt. This harsh environment requires a new study of anode materials for the chlorine evolution reaction. Anode materials can be compared by their kinetic parameters, the transfer coefficient α and the exchange current i0. The basic theory of these properties as they relate to the chlorine evolution reaction has been detailed and an analysis method for finding these effective parameters has been shown and demonstrated.
Probing The Surface Structure Of Ferrocene Modified Electrodes Using Cyclic Voltammetry, Rebekah S. Stanley
Probing The Surface Structure Of Ferrocene Modified Electrodes Using Cyclic Voltammetry, Rebekah S. Stanley
Reviews, Analyses, and Instructional Studies in Electrochemistry (RAISE)
Modifying electrodes imparts new electrochemical properties for use in various applications. To fully understand these electrochemical properties the structure of the modified surface needs to be characterized. Cyclic voltammetry (CV) offers a quick and simple way to determine if the surface structure has been homogeneously modified even at low surface concentrations. Nonideal responses in CV scans give insights to the microenvironments and structure of the monolayer surface that may be indistinguishable in other techniques. Peak fitting CV data, coupled with other surface techniques, can further characterize the contributions and nature of these microenvironments and aid in structural determination.
Techno-Economic Optimization Of A Hybrid Energy System With Limited Grid Connection In Pursuit Of Net Zero Carbon Emissions For New Zealand, Daniel Hill, Shafiqur Rahman Tito, Michael Walmsley, John Hedengren
Techno-Economic Optimization Of A Hybrid Energy System With Limited Grid Connection In Pursuit Of Net Zero Carbon Emissions For New Zealand, Daniel Hill, Shafiqur Rahman Tito, Michael Walmsley, John Hedengren
Faculty Publications
As New Zealand moves towards net zero carbon emissions by 2050, multiple factors must be considered including increased electrical load due to electrification, variability of renewable energy generators, required storage capacity, system economics and limitations on grid transmission capacity. Complex and region-specific interactions between the various design choices involved are likely to require an understanding of a range of optimal and near-optimal designs for proposed micro-grid systems as opposed to a single optimal point. This work develops a novel multiscale optimization algorithm for optimization from a univariate capacity optimization approach to a multivariate one. This enhanced algorithm is applied to …
Unemployment On Native American Reservations, Belle Haslam
Unemployment On Native American Reservations, Belle Haslam
Ballard Brief
Unemployment has long been a persistent issue plaguing Native American communities residing on reservations across the United States, dating back to the establishment of these reservations in the early 19th century. With the average unemployment rate reaching 10.5%, Native Americans face some of the highest rates of joblessness among racial and ethnic minority groups. This disparity in employment is reflected in per capita income figures, which show a staggering $9,000 difference between Native American reservations and adjacent counties, underscoring the economic challenges faced within reservation boundaries. The root causes of unemployment on reservations are multifaceted, including factors such as limited …
The Olmsted Fault, Southernmost Illinois: A Key To Understanding Seismic Hazard In The Northern New Madrid Seismic Zone, Christopher E. Bexfield
The Olmsted Fault, Southernmost Illinois: A Key To Understanding Seismic Hazard In The Northern New Madrid Seismic Zone, Christopher E. Bexfield
Theses and Dissertations
The northernmost extent of the New Madrid seismic zone in the central USA has been investigated using an integrated approach involving both compressional-wave (P) and horizontally polarized-wave (SH) seismic reflection and regional and dedicated borehole geophysical information in order to assess seismic hazard and risk. Our study area, centered around southernmost Illinois and western Kentucky, USA, represents an area of concentrated facilities (e.g., lock and dam sites and chemical plants on the Ohio River near its confluence with the Mississippi River) as well as an area of high potential soil amplification due to earthquake shaking. Integrated high-resolution seismic reflection profiles …
An Investigation Of The Interactions Of Gradient Coherence And Network Pruning In Neural Networks, Zachary Yauney
An Investigation Of The Interactions Of Gradient Coherence And Network Pruning In Neural Networks, Zachary Yauney
Theses and Dissertations
We investigate the coherent gradient hypothesis and show that the coherence measurements are different on real and random data regardless of the network's initialization. We introduce "diffs," an attempt at an element-wise approximation at coherence, and investigate their properties. We study how coherence is affected by increasing the width of simple fully-connected networks. We then prune those fully-connected networks and find that sparse networks outperform dense networks with the same number of nonzero parameters. In addition, we show that it is possible to increase the performance of a sparse network by scaling the size of the dense parent network it …
The Advancement Of Experimental And Computation Tools For The Study Of Molten Salt Chemistry To Facilitate The Extraction Of Strategic Elements In Nuclear Applications, Michael Stoddard
Theses and Dissertations
Nuclear energy presents environmental benefits, yet the challenge of radioactive waste management persists. Advanced solutions, such as Molten Salt Reactors (MSRs), require a more profound understanding of molten salt chemistry. This research aims to develop tools, including a depletion simulator, molten salt electrochemical simulator, and a fluoride-based thermodynamic reference electrode for electrochemical purification. The computationally inexpensive depletion simulator allows for exploration into extraction and processing strategies for molten salt reactors. An illustrative case study on Mo-99 production from MSRs demonstrates the practical application of the theoretical framework, emphasizing the need for optimization in extraction effectiveness and separation difficulty. The electrochemical …
Trip - Transformer Interatomic Potential Predicts Realistic Energy Surface Using Physical Bias, Bryce Eric Hedelius
Trip - Transformer Interatomic Potential Predicts Realistic Energy Surface Using Physical Bias, Bryce Eric Hedelius
Theses and Dissertations
Accurate interatomic energies and forces enable high-quality molecular dynamics simulations, torsion scans, potential energy surface mapping, and geometry optimization. Machine learning algorithms have enabled rapid estimates of energies and forces with high accuracy. Further development of machine learning algorithms holds promise for producing general potentials that support dozens of atomic species. I present my own Transformer Interatomic Potential (TrIP): a chemically sound potential based on the SE(3)-Transformer. TrIP's species-agnostic architecture--using continuous atomic representation and homogenous graph convolutions--encourages parameter sharing between atomic species for more general representations of chemical environments, keeps a reasonable number of parameters, serves as a form of …
Automating Verification Of Bpmn Workflow Functional Correctness Using Model Checking, Bryce Mckay Pierson
Automating Verification Of Bpmn Workflow Functional Correctness Using Model Checking, Bryce Mckay Pierson
Theses and Dissertations
Many critical systems industry-wide demand fail-safe process execution. Many of these systems are beginning to use low-code or no-code (LC/NC) solutions to their problems. Mechanisms for verifying the integrity of LC/NC solutions are extremely limited in comparison to traditional code. One solution exhaustively searches the execution state space for undesirable behavior, but it requires expertise in model checking and extensive manual labor. Additionally, error output from that method is exclusively text-based and demands time and familiarity to comprehend. We introduce a tool for automating model checking of LC/NC solutions. Participation in the automation process requires very little knowledge of the …
"Pasted Up And Printed Out": Watchmen As Ontographic Network, Thomas B. De Groff
"Pasted Up And Printed Out": Watchmen As Ontographic Network, Thomas B. De Groff
Theses and Dissertations
This thesis explores Alan Moore and Dave Gibbons' 1986-87 comic book series Watchmen according to its network structure, paying particular attention to page layout and the establishment of or deviation from the nine-panel "waffle iron" grid. This reading aims to better understand the comic book form, connecting the work of comics theorist Theirry Groensteen to certain elements of actor-network theory and Ian Bogost's notion of the ontograph--a map of being that emphasizes the interobjectivity of networked nodes. This thesis explores the ontographic nature of the comic book form more generally before tracing the meta-textual ontograph in Watchmen. The thesis then …
Head Tail Open: Open Tailed Classification Of Imbalanced Document Data, Chetan Joshi
Head Tail Open: Open Tailed Classification Of Imbalanced Document Data, Chetan Joshi
Theses and Dissertations
Deep learning models for scanned document image classification and form understand- ing have made significant progress in the last few years. High accuracy can be achieved by a model with the help of copious amounts of labelled training data for closed-world classification. However, very little work has been done in the domain of fine-grained and head-tailed(class imbalance with some classes having high numbers of data points and some having a low number of data points) open-world classification for documents. Our proposed method achieves a better classification results than the baseline of the head-tail-novel/open dataset. Our techniques include separating the head-tail …
Development And Evaluation Of Full Performance-Based Procedures For The Estimation Of Liquefaction-Induced Building Settlement In A Non-Free-Field Condition Using Cumulative Absolute Velocity, Dallin Nathan Smith
Theses and Dissertations
Liquefaction induced settlement is an earthquake hazard engineers face when developing infrastructure. Current methods for estimating liquefaction induced settlement are done in a free field condition. This assumption is not an accurate way to describe the soil because in most cases the soil will bear some kind of infrastructure. Evaluation of liquefaction induced settlement in a non-free-field condition is a more appropriate way. Using the Bullock et al. CAV model, Bullock et al liquefaction induced settlement model, and probabilistic seismic hazard software from the USGS, a full performance-based procedure for the estimation of liquefaction-induced building settlement in the non-free-field condition …
Unique K3 Surfaces With Purely Non-Symplectic Automorphism: Insights From Weighted Projective Spaceunique K3 Surfaces With Purely Non-Symplectic Automorphism:\\Insights From Weighted Projective Space, Elizabeth Melville
Theses and Dissertations
K3 surfaces have garnered attention across various fields, from optics and dynamics to high energy physics, making them a subject of extensive study for many decades. Recent work by mathematicians, including Brandhorst [1], has focused on non-symplectic automorphisms, aiming to categorize K3 surfaces that admit such automorphisms. Brandhorst made a list of unique K3 surfaces with purely non-symplectic automorphisms and established specific criteria for a K3 surface to be isomorphic to one on his list. This thesis aims to provide an alternative representation of select K3 surfaces from Brandhorst's list. While Brandhorst predominantly characterizes these surfaces as elliptic K3 surfaces, …
Transferable User-Friendly Machine Learning For Normal Boiling Point Prediction, Frank Tafadzwa Mtetwa
Transferable User-Friendly Machine Learning For Normal Boiling Point Prediction, Frank Tafadzwa Mtetwa
Theses and Dissertations
The estimation of thermophysical properties of chemical compounds holds considerable importance across a multitude of fields, ranging from material science to process design. Among these properties, the normal boiling point (NBP) stands out as a pivotal parameter in scientific and engineering contexts, as it elucidates the state of a substance under standard conditions commonly encountered in nature. Additionally, NBP is extensively documented in various reference materials and databases. Given its paramount importance and widespread availability, prediction methodologies for other properties such as critical temperature, liquid density, vapor pressure, surface tension, liquid viscosity, liquid thermal conductivity, and flash point often rely …
Catchment Water Storage Mediates River Flow Sensitivity To Climate Change, Brian Charles Brown
Catchment Water Storage Mediates River Flow Sensitivity To Climate Change, Brian Charles Brown
Theses and Dissertations
As patterns of precipitation and evapotranspiration change, human water security and aquatic ecosystem health depend on understanding how catchment characteristics interact with climate to control river flow. We tested factors that mediate sensitivity of river flow to fluctuations in climate using a set of 1,148 data-rich, climate diverse catchments in various parts of the world from 2001-2020. We extrapolated these results to an additional 2,012 catchments with sparser data. Using features such as vegetation, land use, hydrology, and local climate, we found that catchments with high aridity to runoff ratios (Fuh's parameter) had 380% higher runoff sensitivity to fluctuations in …
Methods For Finding Best Coset Codes For Physical-Layer Security, Andrew Glenn Swain
Methods For Finding Best Coset Codes For Physical-Layer Security, Andrew Glenn Swain
Theses and Dissertations
Finding best coset codes for secrecy over the binary erasure wiretap channel remains a difficult problem. Greater understanding of the structure of coset codes is necessary to reduce the problem space in which we search for these best codes. This dissertation presents new necessary conditions for a code to be best, including a condition that states that a code must maximize the minimum distance of both itself and its dual. It introduces and evaluates the accuracy of new heuristics to approximate the code's equivocation based on a code's weight enumerator polynomial. We also present a new tool for visualizing the …