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Articles 601 - 630 of 11650
Full-Text Articles in Entire DC Network
Design Considerations For Self-Deploying Origami-Inspired Space Arrays, Kathryn Faith Varela
Design Considerations For Self-Deploying Origami-Inspired Space Arrays, Kathryn Faith Varela
Theses and Dissertations
Origami engineering involves many steps, including selecting a pattern, accommodating for thickness, and choosing stabilization, damping, and deployment methods, the last of which is particularly important if the array is intended to self-deploy. Through metrics and case studies, this research strives to aid designers in creating origami-inspired deployable arrays. The approaches vary as each chapter focuses on a different aspect of origami engineering. By introducing a thickness accommodation technique and reducing complications with rigid-foldability (when applicable), this work shows how the geometrical structure can be modified to help the array stow and deploy. By providing quantitative and qualitative metrics for …
Comparing Gas Composition From Fast Pyrolysis Of Live Foliage Measured In Bench-Scale And Fire-Scale Experiments, David R. Weise, Thomas H. Fletcher, Timothy J. Johnson, Wei Min Hao, Mark Dietenberger, Marko Princevac, Bret W. Butler, Sara S. Mcallister, Joseph J. O'Brien, E Louise Loudermilk, Roger D. Ottmar, Andrew T. Hudak, Akira Kato, Babak Shotorban, Shankar Mahalingham, Tanya L. Myers, Javier Palarea-Albaladejo, Stephen P. Baker
Comparing Gas Composition From Fast Pyrolysis Of Live Foliage Measured In Bench-Scale And Fire-Scale Experiments, David R. Weise, Thomas H. Fletcher, Timothy J. Johnson, Wei Min Hao, Mark Dietenberger, Marko Princevac, Bret W. Butler, Sara S. Mcallister, Joseph J. O'Brien, E Louise Loudermilk, Roger D. Ottmar, Andrew T. Hudak, Akira Kato, Babak Shotorban, Shankar Mahalingham, Tanya L. Myers, Javier Palarea-Albaladejo, Stephen P. Baker
Faculty Publications
Background. Fire models have used pyrolysis data from oxidising and non-oxidising environments for flaming combustion. In wildland fires pyrolysis, flaming and smouldering combustion typically occur in an oxidising environment (the atmosphere). Aims. Using compositional data analysis methods, determine if the composition of pyrolysis gases measured in non-oxidising and ambient (oxidising) atmospheric conditions were similar. Methods. Permanent gases and tars were measured in a fuel-rich (non-oxidising) environment in a flat flame burner (FFB). Permanent and light hydrocarbon gases were measured for the same fuels heated by a fire flame in ambient atmospheric conditions (oxidising environment). Log-ratio balances of the measured gases …
Transient Heat Transfer To Rolling Or Sliding Drops On Inclined Heated Superhydrophobic Surfaces, Joseph Furner, Daniel Maynes, Brian D. Iverson, Julie Crockett
Transient Heat Transfer To Rolling Or Sliding Drops On Inclined Heated Superhydrophobic Surfaces, Joseph Furner, Daniel Maynes, Brian D. Iverson, Julie Crockett
Faculty Publications
The thermal transport to drops that roll or slide down heated superhydrophobic surfaces is explored. High-speed infrared imaging is performed to provide time-resolved measurement of the heat transfer to the drop. Data are obtained for drops moving along smooth hydrophobic and structured superhydrophobic surfaces. Both post and rib style structures with surface solid fractions ranging from 0.06 to 1.0 are considered. The inclination angle of the surfaces was varied from 10 deg to 25 deg, and the drop volume was varied from 12 to 40 µL. The measurements reveal that the drop speed is a strong function of both the …
3d Printed Mounts For Liquid Microdroplet Resonators, Parker A. Awerkamp
3d Printed Mounts For Liquid Microdroplet Resonators, Parker A. Awerkamp
Theses and Dissertations
Liquid microdroplet resonators provide an excellent tool for optical studies due to their innate smoothness and high quality factors, but they can be difficult to control. By using 3D printed mounts to support the droplets, we can obtain precise control over the droplet geometries and positions. We here present our work with oil, water, and ice microdroplets, as well as tools required to enable their study. We first present methods for creating 3D printed mounts for oil microdroplet resonators. The mounts enable precise positioning of the droplets relative to a tapered optical fiber. The oil microdroplet resonators exhibited quality factors …
Psychotherapy Utilization And Outcomes Of Military Veteran-College Students And Student-Rotc Members Compared To Similar Nonmilitary College Students, Jacob Michael Christian Goetz
Psychotherapy Utilization And Outcomes Of Military Veteran-College Students And Student-Rotc Members Compared To Similar Nonmilitary College Students, Jacob Michael Christian Goetz
Theses and Dissertations
This study examines current trends of university counseling center (UCC) utilization among Reserve Officer Training Corps (ROTC) students and student-military Veterans, compared to their nonmilitary-minded peers at a large, private, western university. Given likely differences in the lived experiences between these three populations, research is needed to provide insight on the treatment needs of military-minded students. We examine counseling center data for ROTC (n = 88), Veteran (n = 93), and nonmilitary-minded (n = 16,268) students who presented for counseling services from 2014-2021. A matched sample was obtained from the dataset for some of the analyses. The three groups are …
An Overview Of Contributing Frameworks To Culturally Sustaining Pedagogy, Sarai Clemente Soli
An Overview Of Contributing Frameworks To Culturally Sustaining Pedagogy, Sarai Clemente Soli
Theses and Dissertations
Culturally Sustaining Pedagogy (CSP) is a framework designed to help traditionally marginalized students. Other frameworks have previously tried to draw on culture to help students in similar ways. However, Paris (2012b) claimed that the word sustaining enclosed a meaning of maintaining and enhancing these students' language and cultural practices that no other frameworks did until that point. There is some confusion for educators and others about CSP since it is a newer framework and that there are many of these cultural frameworks analyzing similar concepts. Therefore, the purpose of this literature review was to examine these previous main frameworks that …
Information Geometric Approaches To Optimal Experimental Design And Reduced-Order Modeling In Ocean Acoustics, Jay C. Spendlove
Information Geometric Approaches To Optimal Experimental Design And Reduced-Order Modeling In Ocean Acoustics, Jay C. Spendlove
Theses and Dissertations
This thesis demonstrates the application of information geometry to problems in underwater acoustics. Information geometry combines the fields of information theory and differential geometry by interpreting a multiparameter model as a Riemannian manifold in an ambient data space. Information geometry tools are especially powerful in context of problems of experimental design and model selection in ocean acoustics. The application area specifically considered in this research is geoacoustic inversion, where seabed parameter values are inferred from acoustical data. Chapter 2 contains a paper submitted to the Journal of Theoretical and Computational Acoustics, which introduces information geometry tools such as the model …
Effect Of Local Chain Stiffness On Oligomer Crystallization From A Melt, Pierre Kawak, Christopher Akiki, Douglas R. Tree
Effect Of Local Chain Stiffness On Oligomer Crystallization From A Melt, Pierre Kawak, Christopher Akiki, Douglas R. Tree
Faculty Publications
While the process by which a polymer crystal nucleates from the melt has been extensively studied via molecular simulation, differences in polymer models and simulated crystallization conditions have led to seemingly contradictory results. We make steps to resolve this controversy by computing low-temperature phase diagrams of oligomer melts using Wang-Landau Monte Carlo simulations. Two qualitatively different crystallization mechanisms are possible depending on the local bending stiffness potential. Polymers with a discrete bending potential crystallize via a single-step mechanism, whereas polymers with a continuous bending potential can crystallize via a two-step mechanism that includes an intermediate nematic phase. Other model differences …
Six Connotations Of Sustainability In Civil And Construction Engineering: A Corpus Linguistics Study, Xiaomei Wang, Andrew South, Brett James Hashimoto, Clifton Farnsworth
Six Connotations Of Sustainability In Civil And Construction Engineering: A Corpus Linguistics Study, Xiaomei Wang, Andrew South, Brett James Hashimoto, Clifton Farnsworth
Faculty Publications
This research explores the historic use of the concept of sustainability in civil engineering academic literature and identifies its conceptual evolution and connotative treatment over the last 40 years. We find that academic research addressing sustainability is exponentially increasing and that the focus on sustainability is enlarging from a primarily environmental perspective to include more social elements. Additionally, we propose a set of six connotations of sustainability: assessment, progress, permanence, abstractness, multidimensional, and intersectional. These connotations provide conceptual clarity for academics and practitioners in better-defining sustainability objectives and measuring outcomes. These connotations also promote more efficient collaboration with other necessary …
Ready, Set, Grow: From Micelles To Giant Vesicles Via Biocatalytic Activation, Nicholas P. Bair, Qinyu Zhu, Bryon A. Staynings, Douglas R. Tree, Walter F. Paxton
Ready, Set, Grow: From Micelles To Giant Vesicles Via Biocatalytic Activation, Nicholas P. Bair, Qinyu Zhu, Bryon A. Staynings, Douglas R. Tree, Walter F. Paxton
Faculty Publications
Controlling physicochemical processes that drive changes in supramolecular aggregates is an important objective toward creating artificial soft micro- and nanomachines. Previous research explored the morphology control of membrane-based materials subjected to externally imposed chemical stimuli. Here, we modulate the microscale morphology of pH-responsive assemblies by using biocatalysis to internally generate changes in global pH. Catalytic reactions offer flexibility in the mechanism and rate at which stimuli are introduced to responsive assemblies, ultimately enabling precision and control over size and morphology. We observed, by dynamic light scattering and fluorescence microscopy, substantial microscale differences between assemblies subjected to manually titrated pH changes …
Membrane Hinges For Deployable Systems, C. Mitchel Skinner
Membrane Hinges For Deployable Systems, C. Mitchel Skinner
Theses and Dissertations
Origami-inspired and deployable technology has become increasingly common in a variety of applications including satellite and antenna designs for space applications. The drive to utilize ultra-thin materials in the design of these deployable space structures has led to the development of membrane hinges. Membrane hinges show promise as an effective surrogate fold because of their potential advantages including requiring minimal volume and mass, allowing for small bending radii, and functioning without lubricant. Two challenges associated with membrane hinges include reliability after repeated cyclic loading and predictability of a large deployable with radially-unconstrained membrane hinges. The research presented includes the cyclic …
Characterizing And Manipulating Intra-Die Performance Variation Of Fpgas And Its Application In Security, Hayden C. Cook
Characterizing And Manipulating Intra-Die Performance Variation Of Fpgas And Its Application In Security, Hayden C. Cook
Theses and Dissertations
Field Programmable Gate Arrays (FPGAs) are reconfigurable, high-performing devices that are often used in critical applications. However, like all semiconductors, FPGAs experience transistor aging that can lower performance and lead to device failures. Additionally, device aging also has several security implications. Therefore, understanding the aging mechanisms behind transistor aging is necessary to ensure the reliability of FPGAs. However, current aging studies either rely on simulation alone or are unable to isolate aging effects on specific elements within the FPGA. This dissertation uses the reconfigurability of FPGAs to develop novel aging techniques that allow for the targeted aging of specific areas …
Facets Of Neuroticism As Predictors Of Heart Rate Variability And Psychological Distress, Mikel Cressman
Facets Of Neuroticism As Predictors Of Heart Rate Variability And Psychological Distress, Mikel Cressman
Theses and Dissertations
Heart rate variability (HRV) and personality are related to both physical and mental health outcomes. Previous research has found a relationship between neuroticism and distress while the findings on the relationship between neuroticism and HRV are mixed. Studying the facets of neuroticism may provide a more nuanced view of the effects of personality on HRV and distress. Previous research has suggested that the vulnerability facet of neuroticism appears to be uniquely related to the cardiovascular response to stress. This study's first hypothesis is that individuals with higher scores on the vulnerability facet will have lower heart rate variability. The second …
Drop Dynamics And Heat Transfer During Dropwise Condensation On Superhydrophobic Surfaces, Shaur Humayun
Drop Dynamics And Heat Transfer During Dropwise Condensation On Superhydrophobic Surfaces, Shaur Humayun
Theses and Dissertations
As we seek to address the escalating demand for energy and water, superhydrophobic surfaces have gained the attention of researchers due to their potential to boost condensation heat transfer rates and improve efficiency across various applications. One way to significantly improve dropwise condensation heat transfer rate is to improve drop mobility. Water-repelling properties of superhydrophobic surfaces can help in reducing the size of condensed drops as they depart the surface, thus increasing drop refresh rates by increasing drop mobility. Accurate models of retention forces between drops and superhydrophobic surfaces are needed for predicting drop dynamics including drop mobility. Once drop …
Unveiling Trends, Terminology, And Teaching Competencies Of Blended Courses In Higher Education, Jennifer Lynn Ramsey
Unveiling Trends, Terminology, And Teaching Competencies Of Blended Courses In Higher Education, Jennifer Lynn Ramsey
Theses and Dissertations
This dissertation has been written in a three-article journal-ready format and centers on competencies for blended teaching in higher education. I use the PRISMA process and thematic coding to analyze 34 articles from 2002 to 2022, highlighting strategic combination, learner-centered approaches, and additional support. I also use the Google Search API and content analysis to suggest that blended, digital, and flexible may be post-secondary institutions' most frequently used terminology to describe contexts incorporating online and in-person components. I also gather qualitative data from interviews with faculty to highlight the context and nuances surrounding blended teaching competencies, including creative innovation, technology …
Solving Unsteady Potential Flow Problems In O(N) Time, Ryan Anderson, Andrew Ning
Solving Unsteady Potential Flow Problems In O(N) Time, Ryan Anderson, Andrew Ning
Faculty Publications
Design of vertical takeoff and landing aircraft is challenging in part due to significant aerodynamic interactions between rotors and wings. Computational models can aid in their design, but are computationally expensive. 3-D panel methods coupled with vortex particle wakes offer an attractive solution, but solving for the panel strengths scales poorly for large problems. Multigrid methods, such as Krylov subspace methods in conjunction with the fast multipole method (FMM), have been demonstrated to reduce the scaling to O(𝑁). We explore the performance and limitations of the Krylov-FMM method, traditional matrix-powered GMRES, LU decomposition, and a novel O(𝑁) multigrid approach to …
The Aridification Of The Great Salt Lake, David Thompson
The Aridification Of The Great Salt Lake, David Thompson
Ballard Brief
Throughout Nepal, brick kilns employ thousands of families annually for the seasonal work of crafting and shipping bricks. As families migrate between work in brick factories and agricultural work at home, more factors block their children from a complete and quality education. The open invitation to begin working with their parents and to help provide for the family becomes a strong temptation that causes many children to give up on school. In addition, Nepal's lack of law enforcement frequently allows children to drop out of school early without consequence. Their parents do not attempt to stop them either, making little …
Geometrically Exact Beam Theory For Gradient-Based Optimization, Taylor Mcdonnell, Andrew Ning
Geometrically Exact Beam Theory For Gradient-Based Optimization, Taylor Mcdonnell, Andrew Ning
Faculty Publications
Decades of research have progressed geometrically exact beam theory to the point where it is now an invaluable resource for analyzing and modeling highly flexible slender structures. Large-scale optimization using geometrically exact beam theory remains nontrivial, however, due to the inability of gradient-free optimizers to handle large numbers of design variables in a computationally efficient manner and the difficulties associated with obtaining smooth, accurate, and efficiently calculated design sensitivities for gradient-based optimization. To overcome these challenges, this paper presents a finite-element implementation of geometrically exact beam theory which has been developed specifically for gradient-based optimization. A key feature of this …
Characteristics Of Pyrolysis Products Of California Chaparral And Their Potential Effect On Wildland Fires, Mahsa Alizadeh, David R. Weise, Thomas H. Fletcher
Characteristics Of Pyrolysis Products Of California Chaparral And Their Potential Effect On Wildland Fires, Mahsa Alizadeh, David R. Weise, Thomas H. Fletcher
Faculty Publications
The aim of this study was to investigate the pyrolysis of selected California foliage and estimate the energy content of the released volatiles to show the significance of the pyrolysis of foliage and its role during wildland fires. While the majority of the volatiles released during the pyrolysis of foliage later combust and promote fire propagation, studies on the energy released from combustion of these compounds are scarce. Samples of chamise (Adenostoma fasciculatum), Eastwood’s manzanita (Arctostaphylos glandulosa), scrub oak (Quercus berberidifolia), hoaryleaf ceanothus (Ceanothus crassifolius), all native to southern California, and sparkleberry …
Derivative Propagation Through Vortex Particle Method Simulation, Eric Green, Andrew Ning
Derivative Propagation Through Vortex Particle Method Simulation, Eric Green, Andrew Ning
Faculty Publications
Automatic differentiation (AD) is a powerful tool for evaluating numerical derivatives. In particular, reverse-mode AD provides numerical gradients in a way that is insensitive to the number of input variables. This makes reverse-mode AD well-suited for solving large optimization problems. However, reverse-mode AD has a particularly large associated memory cost because most intermediate values in operations need to be cached. This is problematic for large problems such as aerodynamics simulations, though, since the memory requirements can quickly become impractical. The solution implemented in this work is to provide analytic pullback expressions for functions for which many of the intermediate values …
Trajectory Optimization Of Evtol And Conventional Aircraft: A Comparative Analysis Of Vortex Particle Method And Vortex Lattice + Blade Element Momentum Theory, Andrew Tagg, Ryan Anderson, Cibin Joseph, Andrew Ning
Trajectory Optimization Of Evtol And Conventional Aircraft: A Comparative Analysis Of Vortex Particle Method And Vortex Lattice + Blade Element Momentum Theory, Andrew Tagg, Ryan Anderson, Cibin Joseph, Andrew Ning
Faculty Publications
Trajectory optimization of aircraft transition maneuvers can significantly influence the design of these systems, particularly when making decisions about aircraft geometry, propulsion sizing, and control system design. This paper presents the trajectory optimization of air vehicles including electric vertical takeoff and landing (eVTOL) as well as conventional aircraft. The study evaluates the influence of fidelity in trajectory design by comparing the use of two aerodynamic methods in the context of trajectory optimization. The mid-fidelity method utilizes a vortex lattice method (VLM) to model lifting surfaces while employing blade element momentum theory (BEMT) to model rudimentary rotor-wing interactions. The high-fidelity approach …
Ductape: A Steady-State, Axisymmetric Ducted Fan Analysis Code Designed For Gradient-Based Optimization, Judd Mehr, Andrew Ning
Ductape: A Steady-State, Axisymmetric Ducted Fan Analysis Code Designed For Gradient-Based Optimization, Judd Mehr, Andrew Ning
Faculty Publications
Electric ducted fans have become an intriguing option for the propulsion systems of clean, quiet advanced air mobility technologies due to their potential benefits in both aerodynamic efficiency and reduced noise profiles compared to open rotor systems. Exploration of conceptual electric ducted fan design in the context of novel, and often complex, applications may be greatly aided by the use of optimization techniques. Specifically, gradient-based optimization lends itself to the exploration of large, complex, multi-disciplinary systems due to its inherent scalability. Despite ducted fans/propellers having been relatively well studied for the last century, modern, gradient-based, optimization-ready analysis tools for ducted …
Full Issue: Artificial Intelligence And Data For Nonprofit Organizations, Angie Holzer
Full Issue: Artificial Intelligence And Data For Nonprofit Organizations, Angie Holzer
Journal of Nonprofit Innovation
No abstract provided.
Machine Learning For Nonprofit Organizations, Justin Holzer
Machine Learning For Nonprofit Organizations, Justin Holzer
Journal of Nonprofit Innovation
Nonprofit organizations are often looking for ways to increase efficiency while operating with limited resources. With data more readily available than in the recent past, machine learning provides powerful tools for unlocking valuable insights and enabling nonprofits to do more with limited resources. This paper explores various machine learning techniques to enhance nonprofit operations with an overview of machine learning approaches, including supervised, unsupervised, semi-supervised, and reinforcement learning, and their potential benefits for nonprofit organizations. A practical use-case of donor prediction for fundraising is presented to demonstrate how supervised learning can be employed to identify potential repeat donors. The neural …
Authorship In The Age Of Algorithms: Adapting Copyright Law For Ai-Generated Content, Sydney Thomas
Authorship In The Age Of Algorithms: Adapting Copyright Law For Ai-Generated Content, Sydney Thomas
Journal of Nonprofit Innovation
In the age of Artificial Intelligence (AI), the relationship between technological advancement and legal protection for human creators has become increasingly critical. From Stephen Hawking's admonition of the potential risks of unregulated AI to Sam Altman's advocacy for proactive regulation, this paper navigates the evolving landscape of AI innovation and copyright law. By examining the challenges posed by AI-generated content, including issues of intellectual property infringement and privacy concerns, it highlights the need for adaptive legal frameworks. Strategic enhancements to copyright law must be developed, such as bolstering fair use doctrine and expanding creator rights, to ensure the protection of …
Addressing Social Inequalities Using Ai, Big Data, And Machine Learning, Erica L. Jensen, Lakell Archer, Sumaya Ali
Addressing Social Inequalities Using Ai, Big Data, And Machine Learning, Erica L. Jensen, Lakell Archer, Sumaya Ali
Journal of Nonprofit Innovation
No abstract provided.
Revolutionising Nonprofit Verification With Ai Powered Intelligence, J Unsdorfer
Revolutionising Nonprofit Verification With Ai Powered Intelligence, J Unsdorfer
Journal of Nonprofit Innovation
In an era where stakeholders increasingly demand clarity and honesty, the importance of corporate transparency has reached unprecedented levels. Both businesses and nonprofits are now faced with the challenge of effectively demonstrating their integrity and trustworthiness. Artificial intelligence (AI) offers promising solutions to these challenges by enabling deeper insights into corporate relationships. Venturefy, an Israel-based company, is at the forefront of this movement, using AI to decode complex data sets and verify corporate connections. This article explores how AI works, Venturefy’s unique approach to transparency, and its significant partnership with WikiCharities to enhance transparency in the nonprofit sector.
Research Summaries: Artificial Intelligence And Data For Nonprofits, Erica Jensen
Research Summaries: Artificial Intelligence And Data For Nonprofits, Erica Jensen
Journal of Nonprofit Innovation
No abstract provided.
Trust In Information, Preparation, And Resource Adequacy In Coastal Louisiana, Elizabeth Long-Meek, Michael R. Cope, Scott Sanders, Carol Ward
Trust In Information, Preparation, And Resource Adequacy In Coastal Louisiana, Elizabeth Long-Meek, Michael R. Cope, Scott Sanders, Carol Ward
Undergraduate Honors Theses
Natural disasters pose significant challenges to communities, affecting lives, properties, and infrastructure unpredictably. Coastal regions, like those in southern Louisiana, are particularly vulnerable due to their exposure to hurricanes, coastal erosion, and other chronic environmental hazards exacerbated by climate change. This study investigates the relationship between trust in government and social entities and perceptions of disaster preparedness among residents of Plaquemines and Lafourche parishes, Louisiana. Drawing on data collected via a multi-mode survey, including measures of trust and perceived preparedness, logistic regression models reveal that trust in information from federal, state, and local governments, as well as from community networks …
Evaluating The Effects Of Cheatgrass On Western Burrowing Owls, Kaylee R. Draughon
Evaluating The Effects Of Cheatgrass On Western Burrowing Owls, Kaylee R. Draughon
Theses and Dissertations
There has been a global decline of specialist species observed in recent decades due to the impacts of climate change, invasive species, and habitat loss. Habitat loss and degradation may lead to a mismatch between habitat attractiveness and actual quality, otherwise known as an ecological trap. Ecological traps occur when an organism is constrained by its evolutionary past to select for cues that no longer accurately predict habitat quality. Specialist species are more susceptible to ecological traps due to greater reliance on and fidelity to historic sites and resources. The burrowing owl (Athene cunicularia), a specialist bird species adapted to …