Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (11526)
- Social and Behavioral Sciences (8883)
- Physical Sciences and Mathematics (8772)
- Education (7974)
- Arts and Humanities (6822)
-
- Life Sciences (4988)
- Medicine and Health Sciences (4198)
- Psychology (3519)
- Computer Sciences (2735)
- Business (2722)
- Electrical and Computer Engineering (2210)
- Aerospace Engineering (1776)
- Mechanical Engineering (1705)
- Chemistry (1403)
- Civil and Environmental Engineering (1335)
- Sociology (1334)
- Operations Research, Systems Engineering and Industrial Engineering (1288)
- Physics (1151)
- Communication (1013)
- History (1006)
- Religion (959)
- Higher Education (957)
- Art and Design (949)
- Educational Administration and Supervision (905)
- Educational Leadership (887)
- Biology (869)
- Curriculum and Instruction (834)
- Earth Sciences (830)
- Architecture (803)
- Mormon Studies (787)
- Institution
-
- University of North Dakota (13312)
- Brigham Young University (11126)
- Air Force Institute of Technology (8055)
- Virginia Commonwealth University (7663)
- Mississippi State University (6407)
-
- University of South Carolina (6088)
- Rowan University (3483)
- American University in Cairo (2692)
- University for Business and Technology in Kosovo (2537)
- University of Texas Rio Grande Valley (1846)
- Illinois State University (1830)
- Pepperdine University (1685)
- Florida Institute of Technology (1636)
- City University of New York (CUNY) (1517)
- University of Arkansas Little Rock (1333)
- St. John's University (1105)
- Columbus State University (754)
- Nova Southeastern University (710)
- SASTRA Deemed to be University (228)
- Texas A&M International University (219)
- Seattle Pacific University (14)
- UAlaska System (7)
- CentraCare Health (6)
- Southern Methodist University (4)
- Michigan Technological University (3)
- Utah State University (3)
- Alabama State University (2)
- University of Arkansas, Fayetteville (2)
- Louisiana Tech University (1)
- Keyword
-
- Education (718)
- North Dakota (547)
- United States (459)
- Leadership (407)
- Dissertations (EdD) -- Organizational leadership (382)
-
- Utah (363)
- History (356)
- Machine learning (355)
- #antcenter (348)
- Gender (326)
- Women (277)
- Painting (267)
- Autism (234)
- Egypt (232)
- Depression (230)
- Dissertations (PsyD) -- Psychology (228)
- Art (227)
- Higher education (215)
- Motivation (211)
- Technology (208)
- Mental health (207)
- Optimization (207)
- Cancer (200)
- Identity (196)
- Children (195)
- Memory (193)
- Self-efficacy (187)
- Professional development (186)
- Mormon Church (185)
- Performance (180)
- Publication Year
- File Type
Articles 8341 - 8370 of 74268
Full-Text Articles in Entire DC Network
An Analytical Framework For Photonic Storage And Retrieval: Implications For Quantum Optical Networks, Billie V. Deluca
An Analytical Framework For Photonic Storage And Retrieval: Implications For Quantum Optical Networks, Billie V. Deluca
Theses and Dissertations
Quantum information and communication is the next revolution in information technology. However, communication through quantum networks will require the ability to transmit, store, and interact with photonic quantum bits (qubits). The focus of this dissertation is a theoretical description of a promising technology for storage of photonic states employing electromagnetically induced transparency (EIT). A general semiclassical model for EIT photonic storage will be developed, a key capability required for understanding the effect of storage that is independent of the photonic state being stored. This dissertation demonstrates the capability of this model to predict light pulses retrieved from EIT storage as …
Quantifying Atmospheric Turbulence Effects On Image Quality Using A Deconvolution Algorithm, Ahmad M. Almalki
Quantifying Atmospheric Turbulence Effects On Image Quality Using A Deconvolution Algorithm, Ahmad M. Almalki
Theses and Dissertations
Imaging through turbulence is affected by several factors including imaging system specifications, imaging system setup and more importantly the atmospheric turbulence as it is uncontrollable. One important parameter which is used to quantify the atmospheric turbulence severity is the atmospheric coherence diameter (��0 ), known as Fried's parameter. This thesis explores ways to characterize the atmospheric turbulence effects on image quality using simulated and laboratory generated turbulence where ��0 is estimated using a maximum a posteriori (MAP) estimator and frequency domain analysis algorithms. Furthermore, image quality metrics such as Peak Signal to Noise Ratio (PSNR), Structural Similarity (SSIM) …
Analysis Of Coronal Magnetic Field Parameters During X- And M-Class Solar Flares, Seth H. Garland
Analysis Of Coronal Magnetic Field Parameters During X- And M-Class Solar Flares, Seth H. Garland
Theses and Dissertations
Using Non-Linear Force Free Field (NLFFF) extrapolation, 3D magnetic fields were modeled from the 12-minute cadence Helioseismic and Magnetic Imager (HMI) photospheric vector magnetograms, spanning a time period of one hour before through one hour after the start of 18 X-class flares and 12 M-class flares. Several magnetic field parameters were calculated from the modeled fields directly – as well as from the power spectrum of surface maps generated by summing the fields along the vertical axis – for two different regions: areas with photospheric Bz ≥ 300 G (Active Region – AR) and areas above the photosphere with the …
Brdf Measurements And Physical Optics Modeling Applied To Anisotropic Satellite Solar Cells, Madilynn E. Compean
Brdf Measurements And Physical Optics Modeling Applied To Anisotropic Satellite Solar Cells, Madilynn E. Compean
Theses and Dissertations
Light curve analysis is often used to discern information about satellites in geosynchronous orbits, and since solar panels comprise relatively large surface areas, their reflected energy can contribute greatly to observed light curves. Data was collected using a space qualified solar cell interrogated by a green HeNe laser. The data validated certain aspects from previous work, but also identified multi-slit behavior, showed that the specular term was a second diffraction pattern, and diagnosed the out-of-plane diffraction curvature as the conical diffraction phenomenon. Two physical-optics-based models were developed to incorporate these new features and better predict solar cell BRDF solely from …
The Effect Of Non-Offending Caregiver Substance Use On Posttraumatic Stress Symptoms In Survivors Of Child Sexual Abuse, Katelynn Robison Jones
The Effect Of Non-Offending Caregiver Substance Use On Posttraumatic Stress Symptoms In Survivors Of Child Sexual Abuse, Katelynn Robison Jones
Theses and Dissertations
Prevalence rates for child sexual abuse and substance use have often been difficult to determine. The Centers for Disease Control and Prevention (2022) estimated that one in four girls and one in thirteen boys experience childhood sexual abuse (CSA) in the United States. Similarly, the Substance Abuse and Mental Health Services Administration (2021) estimated that 58.7% of individuals over the age of 12 have used a substance in the last month. Despite the identification of both of these experiences as relatively common societal concerns, the impact of parental substance use on children and families has primarily been evaluated in a …
Removal Of Diclofenac Pharmaceutical Residues From Wastewater, Fatma Aly
Removal Of Diclofenac Pharmaceutical Residues From Wastewater, Fatma Aly
Theses and Dissertations
As diseases worldwide and in Egypt are increasing by time, developing, and producing new medicines is massively expanding. The use of pharmaceutical compounds is rising worldwide. Diclofenac compound is used in plenty of different kinds of drugs as a nonsteroidal anti-inflammatory drug “NSAID” treating inflammation, osteoarthritis and rheumatoid. Due to excessive exposure to diclofenac -from humans and animals, large amounts are found in the water streams and the environment. Most of the conventional treatment methods is not capable of the complete removal of the diclofenac. Therefore, most of it is thrown back into the water bodies badly affecting the environment, …
Countnet3d: A 3d Computer Vision Approach To Infer Counts Of Occluded Objects With Quantified Uncertainty, Stephen W. Nelson
Countnet3d: A 3d Computer Vision Approach To Infer Counts Of Occluded Objects With Quantified Uncertainty, Stephen W. Nelson
Theses and Dissertations
3D scene understanding is an important problem that has experienced great progress in recent years, in large part due to the development of state-of-the-art methods for 3D object detection. However, the performance of 3D object detectors can suffer in scenarios where extreme occlusion of objects is present, or the number of object classes is large. In this paper, we study the problem of inferring 3D counts from densely packed scenes with heterogeneous objects. This problem has applications to important tasks such as inventory management or automatic crop yield estimation. We propose a novel regression-based method, CountNet3D, that uses mature 2D …
Evaluating Frozen Soil Properties With Electrical Resistivity Measurement And Electro-Magnetic Induction Methods, Rui Liu
Theses and Dissertations
Electromagnetic induction was utilized in the past by the United States Army Corps of Engineers as a method of detecting unexploded ordinance, while it has the potential to act as a novel method of investigating frozen soils in cold regions. In this study, we performed lab-scale 1D electrical resistivity measurements under freeze-thaw circumstances on frost-susceptible soils with varied soil properties. We implemented an empirical model from our experiments into a COMSOL finite element model at both laboratory and field scales to simulate soil electrical resistivity response under both short-term and long-term sub-freezing conditions. Dynamic temperature-dependent soil properties, most notably unfrozen …
User Engagement With Apps For Depression, Danielle Rae Schweitzer
User Engagement With Apps For Depression, Danielle Rae Schweitzer
Theses and Dissertations
Depression is a debilitating and prevalent psychiatric condition, however, few individuals with depression seek mental health treatment. Mental health apps (MHapps) represent one treatment delivery option that may reduce gaps in mental health care. Current evidence suggests that MHapps are efficacious for reducing depressive symptoms, yet little is known about how MHapps are effective. Thus, the aims of the present study were 1) to examine whether two MHapps were effective for reducing depressive symptoms and 2) to determine whether variables such as user engagement, guidance, outcome expectancies, preferences, and coping skill development were associated with effectiveness. A community sample (N=20) …
The Effect Of Percussion And Rhythm-Based Interventions On Children With Social, Emotional And Behavioral Goals, Lesli Woods
The Effect Of Percussion And Rhythm-Based Interventions On Children With Social, Emotional And Behavioral Goals, Lesli Woods
Theses and Dissertations
This study explored the effect of percussion and rhythm-based interventions on children with emotional and behavioral goals. Five students from an after-school/summer program were analyzed in a case-study format. The five skills analyzed within this study included those of cooperation with others, remaining on task, refraining from interrupting others, demonstrating pro-social interactions, and remaining with the group. An additional interview was conducted with the children to understand their perception of the interventions and how it affected their social, emotional, and behavioral skills. The students themselves suggested that the music had a positive impact on their behavior and social skills, specifically …
Exploring Technology Innovation In Harvard Case Method Teaching, Simon Greathead
Exploring Technology Innovation In Harvard Case Method Teaching, Simon Greathead
Theses and Dissertations
This paper is an analysis of the affordances technology provides Harvard Case Method (HCM) teaching. The article focuses on the observations and subsequent interviews of multiple instructors over time as they taught the HCM in-person, online through the Covid pandemic, and post-Covid. We identify adjustments instructors made using technology to augment in-person teaching of the HCM post-Covid. This article proposes the PICRAT (Passive, Interactive, Creative, Replace, Amplify, Transform) model of technology integration as a framework for analyzing how instructors used technology to enhance HCM teaching. We observed multiple technology innovations that contributed to the passive, interactive, and creative learning environment …
Undergraduate Students' Conceptions Of Ngss Science And Engineering Practices, Jessie Webb
Undergraduate Students' Conceptions Of Ngss Science And Engineering Practices, Jessie Webb
Theses and Dissertations
In 2013, a new set of science standards was introduced for K-12 science education, called the Next Generation Science Standards (NGSS), which focused on three dimensions of science learning that work together: disciplinary core ideas, crosscutting concepts, and science and engineering practices. These standards are novel in their emphasis on students needing more than only content knowledge to learn science and engineering. The NGSS science and engineering practices (SEPs) stress the importance of students engaging in the authentic practices of scientists and engineers to help them think like a scientist, practice science themselves, and overcome the misconception that science is …
Performance Of Siso And Mimo Antenna Systems In Suburban And Urban Scenarios For V2i Communications At 5.9 Ghz And 28 Ghz, Oluwaseun Falade
Performance Of Siso And Mimo Antenna Systems In Suburban And Urban Scenarios For V2i Communications At 5.9 Ghz And 28 Ghz, Oluwaseun Falade
Theses and Dissertations
As the need for Vehicle to Infrastructure (V2I) innovations increases, further research is needed to test the performance of antennas installed on vehicles in realistic scenarios including their radiation patterns and optimal location. This thesis considers realistic suburban and urban scenarios with SISO and MIMO antennas for V2I systems at 5.9 GHz and 28 GHz. The simulation is based on Ray tracing (RT) channel models to accurately model the effects of obstacles such as buildings and vehicles on the communication signals. Time-varying vehicular environments are simulated using a 3-D RT tool involving a vehicle and a base station. This research …
Real Time Tracking Of Sleep Behaviors As A Predictor Of Suicidal Ideation For Young Adults With Autism Spectrum Disorder And Social Anxiety, Yong Seuk Steven Lograsso
Real Time Tracking Of Sleep Behaviors As A Predictor Of Suicidal Ideation For Young Adults With Autism Spectrum Disorder And Social Anxiety, Yong Seuk Steven Lograsso
Theses and Dissertations
Suicide continues to be a critical concern for society as one of the leading causes of death in the United States, increasing from 10.4 to 13.5 per 100,000 from 2000 to 2016. This risk is further increased up to 8 times for individuals with Autism Spectrum Disorder. Suicidal thoughts and behaviors have been difficult to predict on a moment-by-moment basis, in part due to technological challenges. Suicidal ideation has been identified as an important indicator of suicidal behavior and an important measurement for predicting suicide in both neurotypical individuals and individuals with autism spectrum disorder. In particular, sleep disturbances are …
Estimating Hemispheric Specialization In Autistic And Neurotypical Individuals, Madeline Peterson
Estimating Hemispheric Specialization In Autistic And Neurotypical Individuals, Madeline Peterson
Theses and Dissertations
While the brain appears to be symmetrical, macroscopic differences or asymmetries between the two hemispheres emerge through careful quantitative study. Functional asymmetries can accompany these structural asymmetries, and these can be a reflection of hemispheric specialization, or the predominant hosting of macroscale functional network and its accompanying functional properties by a given hemisphere. Prior work has identified the specialization of language to the left hemisphere, visuospatial attention to the right hemisphere, and a dual specialization of executive control to both hemispheres. However, it is largely unknown how specialization is characterized at an individual level, particularly in terms of identifying the …
Pop Gugak And E-Sang: Negotiating Traditional And Pop Genre Categories In Expressions Of Identity, Jessica Ellis
Pop Gugak And E-Sang: Negotiating Traditional And Pop Genre Categories In Expressions Of Identity, Jessica Ellis
Theses and Dissertations
Korean traditional music has a popularity problem among Korea's contemporary audiences; given the choice of what to listen to, few South Koreans choose to listen to gugak. To address and overcome this popularity problem, traditional Korean musicians are negotiating and reconstructing traditional Korean music by adopting, appropriating, and altering elements of Korean and international pop music. To this end, Gugak groups recently have been incorporating western musical practices and aesthetics in their performances in digital platforms (YouTube and reality television programs) and in concerts to contemporize the genre and develop a more positive relationship between Koreans and their national music. …
Gene Dive: Assessing The Diversity Of Perchlorate Reducing Genes In Mars Analog Environments, Colin Michael Robinson
Gene Dive: Assessing The Diversity Of Perchlorate Reducing Genes In Mars Analog Environments, Colin Michael Robinson
Theses and Dissertations
Biotic perchlorate reduction, a metabolic process that potentially occurs on Mars, has long been the subject of speculation in astrobiology. To determine whether it could be a viable metabolic strategy on the Red Planet, we sought to determine whether biotic perchlorate reduction could evolve and persist in Mars-analog environments on Earth. In this study, we introduce Gene Dive, a novel computational methodology that leverages profile hidden Markov models, sequence alignment, phylogenetic tree construction, and Faith's phylogenetic diversity to probe the prevalence and diversity of perchlorate reducing genes in metagenomes. To determine whether biotic perchlorate reduction persists in a wide range …
Enhanced Capabilities For Investigating Local Structure And Magnetism: Three Dimensional Magnetic Pair Distribution Function And Symmetry Mode Analysis, Parker Hamilton
Enhanced Capabilities For Investigating Local Structure And Magnetism: Three Dimensional Magnetic Pair Distribution Function And Symmetry Mode Analysis, Parker Hamilton
Theses and Dissertations
The local structure, atomic and magnetic structure correlated over a small length scale, of a material has a strong impact on material properties. Pair distribution function (PDF) analysis is a strong tool to investigate local structure and magnetism of this nature. This work outlines extensions to current one dimensional magnetic pair distribution functions (1D-mPDF) and the fitting of structures with symmetry breaking local atomic distortions. 1DmPDF analysis has been used to study local magnetic structure, but requires a rotational averaging of the correlations so directional information is lost, as in powder diffraction experiments. Three dimensional difference magnetic pair distribution function …
A Colorfully Natural Twin Higgs Model, Logan Coleman Page
A Colorfully Natural Twin Higgs Model, Logan Coleman Page
Theses and Dissertations
Twin Higgs models have the potential to explain phenomena outside of the Standard Model and provide an natural explanation of the Higgs mass. Here I explore a new realization of the twin Higgs concept with an SU(4)c symmetry that is spontaneously broken in the Standard Model sector, but remains unbroken in the Twin sector. I detail the phenomenological results produced by this model. I show that this construction leads to a qualitatively new behavior regarding the fine-tuning of the Higgs mass due to the top-quark sector.
Constructing Stellar Mass Models For Early-Type Galaxies With Circumnuclear Disks, Jared R. Davidson
Constructing Stellar Mass Models For Early-Type Galaxies With Circumnuclear Disks, Jared R. Davidson
Theses and Dissertations
Dusty circumnuclear disks (CNDs) in luminous early-type galaxies (ETGs) show regular, dynamically cold molecular gas kinematics. For a growing number of these ETGs, Atacama Large Millimeter/sub-millimeter Array (ALMA) CO imaging and detailed gas-dynamical modeling have yielded moderate to high precision black hole (BH) mass (M_BH) determinations. To date, however, few studies have explored the effects of dust attenuation, or uncertainties in dust corrections, on recovered stellar luminosity models from high angular resolution optical/near-IR observations and M_BH measurements. Recent kinematic studies that modeled ALMA CO data sets have found that uncertainties in the intrinsic central stellar surface brightness slope due to …
"The Trees Act Not As Individuals"--Learning To See The Whole Picture In Biology Education And Remote Sensing Research, Rebeka A.F. Greenall
"The Trees Act Not As Individuals"--Learning To See The Whole Picture In Biology Education And Remote Sensing Research, Rebeka A.F. Greenall
Theses and Dissertations
To increase equity and inclusion for underserved and excluded Indigenous students, we must make efforts to mitigate the unique barriers they face. As their knowledge systems have been historically excluded and erased in Western science, we begin by reviewing the literature on the inclusion of Traditional Ecological Knowledge (TEK) in biology education and describe best practices. Next, to better understand how Native Hawaiian and other Pacific Islander (NHPI) students integrate into the scientific community, we used Social Influence Theory as a framework to measure NHPI student science identity, self-efficacy, alignment with science values, and belonging. We also investigated how students …
The Synthesis And Optimization Of Conductive Carbons From Renewable Resources For Supercapacitor Applications, Iris Denmark
The Synthesis And Optimization Of Conductive Carbons From Renewable Resources For Supercapacitor Applications, Iris Denmark
Theses and Dissertations
The use of fossil fuels has played a pivotal role in the evolution of energy storage devices and the generation of electricity. With that, we have now entered an era in which we have become primarily dependent on these non-renewable resources which have become increasingly scarce overtime. This has driven us toward a pertinent demand for alternative sources of energy. There are various forms of alternative energy in which biomass is the most used. Carbon is becoming the most commonly used material for energy applications due to its versatility and bioavailability, including that which is sourced from biomass. Herein is …
Phosphorus Sorption And Kinetics Across The Sediment-Water Interface Of Utah Lake, A Shallow Eutrophic Lake, Forrest Fielding Stretch Jarvis Jarvis
Phosphorus Sorption And Kinetics Across The Sediment-Water Interface Of Utah Lake, A Shallow Eutrophic Lake, Forrest Fielding Stretch Jarvis Jarvis
Theses and Dissertations
Internal sediment phosphorus (P) cycling may regulate harmful algal blooms (HABs) in shallow eutrophic lakes. Utah Lake frequently experiences HABs despite its high alkalinity and P-rich sediment. Phosphorus cycling between the lakebed and the water column is dependent upon stable P-sorption with organic matter (OM) and mineral species, which can vary with substrate availability, P-concentrations, temperature, redox, pH, and microbial activity. A full biogeochemical analysis of the water and sediment across seven sites shows Utah Lake to be spatially well-mixed in terms of composition and sorption, with few exceptions. Sediment P-concentrations (avg. 677 mg-P kg-1) primarily correlate with redox-sensitive iron …
Graduate Student Experiences With Food Insecurity, Melanie Ibarra
Graduate Student Experiences With Food Insecurity, Melanie Ibarra
Theses and Dissertations
This research study aimed to examine and analyze food-insecure graduate student experiences at Rowan University. Graduate student experiences are often left out of current literature and this study was conducted to uncover and discuss how food insecurity affects this population and provide recommendations through nuanced food-insecure graduate student experiences. This study used a qualitative phenomenological approach including semi-structured interviews with five participants. A thematic analysis was used to categorize the findings of five themes: Stigma, Academic Engagement, Physical and Mental Health, Coping Mechanisms, and Food Resources. The findings of this study allowed for the transition into further recommendations for practice …
Parental Roles In K-12 Online Education, Barbara Tanner Sandberg
Parental Roles In K-12 Online Education, Barbara Tanner Sandberg
Theses and Dissertations
Parental support roles in K-12 online learning differ from traditional schools. Since K-12 students typically have not developed the self-regulation skills necessary for academic engagement, parents partner with schools to provide the affective, behavioral, and cognitive engagement support necessary for academic success. Through 21 semistructured interviews with parents supporting K-12 students in varied online contexts, this study delineates how parents provided support in each of these dimensions of engagement. The participants felt that in online education, parents should take the primary responsibility for behavioral engagement support, and that teachers were primarily responsible for cognitive support. Parents believed they shared affective …
Food Web Of Icy Strait, Alaska: Comparison Of Position, Size, And Overlap Of Trophic Niche Among Fish Species, Andrew D. Suchomel
Food Web Of Icy Strait, Alaska: Comparison Of Position, Size, And Overlap Of Trophic Niche Among Fish Species, Andrew D. Suchomel
Theses and Dissertations
The Icy Strait of southeast Alaska, USA is an ideal system to study how ecological diversity is maintained. This area has historical ecological significance and supports diverse assemblages of fish species that are easily sampled. We used stable isotope analysis using δ13C and δ15N stable isotope ratios. Using these isotope ratios, we quantified trophic niche position, size, and overlap and compared how those trophic niche metrics varied using ecological and evolutionary perspectives. For ecological variation, mean total length, and δ13C trophic niche position has positive relationships with trophic niche size while total percent trophic niche overlap had a strong negative …
Preparing For V2x Deployment: Evaluating Current Anonymity Implementations, And Developing A Framework For Gauging Roadside Unit Networkability, Daniel Arnaudov Sharp
Preparing For V2x Deployment: Evaluating Current Anonymity Implementations, And Developing A Framework For Gauging Roadside Unit Networkability, Daniel Arnaudov Sharp
Theses and Dissertations
In this thesis we answer two questions relating to the impending deployment of V2X. We answer, "What is the state of current privacy measures implemented to prevent tracking and promote anonymity?" We answer this by showing that tracking methods used to circumvent changing IDs are possible. We also show through conservative calculations that this problem will not go away on its own and requires direct effort. We also answer, "Is the available production V2X hardware ready for scalable deployment?" To do this we develop a framework for evaluating RSUs and many of their core functions related to deployment, scalability, and …
Designed For Better Control: Using Kinematic And Dynamic Metrics To Optimize Robot Manipulator Design, John R. Morrell
Designed For Better Control: Using Kinematic And Dynamic Metrics To Optimize Robot Manipulator Design, John R. Morrell
Theses and Dissertations
In the field of control theory, optimal performance is generally defined as the best possible controlled performance given a static, unchangeable plant system. However, principled design of the underlying system can make designing effective controllers easier and dramatically improve the final control performance beyond what any finely tuned controller could achieve alone. This work develops performance metrics for serial robot arms which help guide the design and optimization of the structure of the arm to achieve greater final performance. First, a kinematic (motion-based) metric called the Actuator Independence Metric (AIM) measures the uniqueness of the movement capabilities of the different …
Measuring Microparticle Adhesion Via High-Speed Rotor, Jacob C. Fearnley
Measuring Microparticle Adhesion Via High-Speed Rotor, Jacob C. Fearnley
Theses and Dissertations
Much is known about the atomic/molecular theories that govern adhesion as well as the macroscopic aspects and properties of adhesion. However, adhesion in the microparticle regime is poorly characterized. We report on experiments that use centrifugal force to remove polystyrene (PS) particles from the surface of a high-speed titanium rotor operated in vacuum. This unique rotor can apply forces far greater than other centrifugal force methods or related techniques using atomic force spectroscopy. The mode of attachment, whether particles were located on the windward side versus leeward side of the spinning rotor, time spent in vacuum prior to experiments, and …
Detailed Characterization Of Material Deformation, Alexander J. Farnsworth
Detailed Characterization Of Material Deformation, Alexander J. Farnsworth
Theses and Dissertations
This dissertation presents a comprehensive exploration of material deformation at the atomic level, investigating key findings and contributions through three fundamental methods: Sum Frequency Generation Spectroscopy (SFG), X-ray Diffraction (XRD), and Electron Backscatter Diffraction (EBSD). The research commences by uncovering the material dependency of nonresonant responses in both SFG and Second Harmonic Generation (SHG) signals. This redefinition of the nonresonant component as an information-rich carrier, rather than mere background noise, leads to novel insights into the potential applications of SFG. The study then delves further into the influence of mechanical stress on materials, establishing a connection between dislocation density on …