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Articles 1 - 30 of 41
Full-Text Articles in Physical Sciences and Mathematics
Conformational Analysis Of A Furan, Thiophene Alternating Π System, Laura Cline
Conformational Analysis Of A Furan, Thiophene Alternating Π System, Laura Cline
Honors Theses
Organic materials with conjugated Ï€-electron networks are increasingly being studied as an alternative to inorganic semiconductors. In order to effectively transport charge as a semiconductor, the organic materials should maintain a planar conformation, exhibit Ï€ conjugation, and be rigid to rotational interconversion. Both furan and thiophene systems have been investigated as potential organic semiconductors but difficulties with solubility, synthesis, and effectiveness hampered these efforts. A novel furan-thiophene hybrid system that exhibits promising semiconducting properties is examined here. Full geometry optimizations and corresponding harmonic vibrational frequency computations were run on a diverse set of potential furan and thiophene oligomer structures using …
Paleosol Development And Trace Fossils In The Upper Triassic Cooper Canyon Formation Of The Dockum Group In Andrews County, Texas, Michael Charles Gratzer
Paleosol Development And Trace Fossils In The Upper Triassic Cooper Canyon Formation Of The Dockum Group In Andrews County, Texas, Michael Charles Gratzer
Honors Theses
It is unknown whether a relationship exists between paleosol development and the number of burrows in a paleosol. It is also unknown whether a relationship exists between the number of burrows in a paleosol and the diameters of those burrows. This paper details the methods, results, and conclusions of an investigation of these relationships. I assess the development of several paleosols in a core sample of the Upper Triassic Cooper Canyon Formation of the Dockum Group from well B-133 in Andrews County, Texas, using development scales based on methods from Bown and Kraus (1993) and Abels et al. (2013). I …
Reducing Cache Contention On Gpus, Kyoshin Choo
Reducing Cache Contention On Gpus, Kyoshin Choo
Electronic Theses and Dissertations
The usage of Graphics Processing Units (GPUs) as an application accelerator has become increasingly popular because, compared to traditional CPUs, they are more cost-effective, their highly parallel nature complements a CPU, and they are more energy efficient. With the popularity of GPUs, many GPU-based compute-intensive applications (a.k.a., GPGPUs) present significant performance improvement over traditional CPU-based implementations. Caches, which significantly improve CPU performance, are introduced to GPUs to further enhance application performance. However, the effect of caches is not significant for many cases in GPUs and even detrimental for some cases. The massive parallelism of the GPU execution model and the …
Temperature And Pressure Effects On Elastic Properties Of Relaxor Ferroelectrics And Thermoelectrics: A Resonant Ultrasound Spectroscopy Study, Sumudu Tennakoon
Temperature And Pressure Effects On Elastic Properties Of Relaxor Ferroelectrics And Thermoelectrics: A Resonant Ultrasound Spectroscopy Study, Sumudu Tennakoon
Electronic Theses and Dissertations
Relaxor ferroelectric lead magnesium niobate-lead titanate (PMN-PT) material exhibits exceptional electromechanical properties. The material undergoes a series of structural phase transitions with changes in temperature and the chemical composition. The work covered in this dissertation seek to gain insight into the phase diagram of PMN-PT using temperature and pressure dependence of the elastic properties. Single crystal PMN-PT with a composition near morphotropic phase boundary (MPB) was investigated using a resonant ultrasound spectroscopy (RUS) methodologies in the temperature range of 293 K - 800 K and the pressure range from near vacuum to 3.4 MPa. At atmospheric pressure, significantly high acoustic …
Biophysical Characterization Of A Proline Mutant Of Neural Cadherin, Keshia S. Dykes
Biophysical Characterization Of A Proline Mutant Of Neural Cadherin, Keshia S. Dykes
Electronic Theses and Dissertations
Cadherins are calcium dependent glycoproteins whose homophilic interactions mediate cell-cell adhesion in solid tissues. They are comprised of an extracellular region, a transmembrane region and a cytoplasmic region. The extracellular region plays a critical role in cadherin-mediated cell adhesion, and has five tandemly repeated ectodomains (ec1-ec5), with three calcium binding sites situated in each interface between the domains. Dimerization of cadherin occurs through formation of adhesive interactions between extracellular domains of cadherins from neighboring cells. Adhesive interaction occurs at the interfaces of ec1 domains of two molecules originating from different cell surfaces. Dimerization is critically dependent on the binding of …
Anodic Metal Dissolution In Haloaluminate Molten Salts/Ionic Liquids, Chen Wang
Anodic Metal Dissolution In Haloaluminate Molten Salts/Ionic Liquids, Chen Wang
Electronic Theses and Dissertations
The anodization of Aluminium was investigated in the low-melting, mixed halide molten salt system, lialbr4-naalcl4-kalcl4 (30-50-20 m/o), and in the Lewis acidic Chloroaluminate ionic liquid, aluminum chloride-1-ethyl-3-methylimidazolium chloride (alcl3-etmeimcl) using rotating disk electrode voltammetry. In both cases, at modest overpotentials, the anodization reaction proceeds under mixed kinetic/mass-transport control. However, at larger positive overpotentials and correspondingly higher anodization rates, the reaction transitions to a mass transport-limited process governed by the dissolution of a passive layer of alcl3(s) and/or albr3(s) on the electrode surface. In alcl3-etmeimcl, the passive current density scales linearly with the concentration of alcl4- in the ionic liquid. The …
Computation Of Acoustic Ressure Fields Produced In Feline Brain By High-Intensity Focused Ultrasound, Nazanin Omidi
Computation Of Acoustic Ressure Fields Produced In Feline Brain By High-Intensity Focused Ultrasound, Nazanin Omidi
Electronic Theses and Dissertations
In 1975, Dunn et al. (Jasa 58:512-514) shothat a simple relation describes the ultrasonic threshold for cavitation induced changes in the mammalian brain. The thresholds for tissue damage were estimated for a variety of acoustic parameters in exposed feline brain. The goal of this study was to improve the estimates for acoustic pressures and intensities present in vivo during those experimental exposures by estimating them using nonlinear rather than linear theory. In our current project, the acoustic pressure waveforms produced in the brains of anesthetized felines were numerically simulated for a spherically focused, nominally f1-transducer (focal length = 13 cm) …
Independent Domination Of Subcubic Graphs, Bruce Allan Priddy
Independent Domination Of Subcubic Graphs, Bruce Allan Priddy
Electronic Theses and Dissertations
Let G be a simple graph. The independent domination number i(G) is the minimum cardinality among all maximal independent sets of G. A graph is subcubic whenever the maximum degree is at most three. In this paper, we will show that the independent domination number of a connected subcubic graph of order n having minimum degree at least two is at most 3(n+1)/7, providing a sharp upper bound for subcubic connected graphs with minimum degree at least two.
On Topological Indices And Domination Numbers Of Graphs, Shaohui Wang
On Topological Indices And Domination Numbers Of Graphs, Shaohui Wang
Electronic Theses and Dissertations
Topological indices and dominating problems are popular topics in Graph Theory. There are various topological indices such as degree-based topological indices, distance-based topological indices and counting related topological indices et al. These topological indices correlate certain physicochemical properties such as boiling point, stability of chemical compounds. The concepts of domination number and independent domination number, introduced from the mid-1860s, are very fundamental in Graph Theory. In this dissertation, we provide new theoretical results on these two topics. We study k-trees and cactus graphs with the sharp upper and lower bounds of the degree-based topological indices(Multiplicative Zagreb indices). The extremal cacti …
The View From Ventress - 2016, University Of Mississippi. College Of Liberal Arts
The View From Ventress - 2016, University Of Mississippi. College Of Liberal Arts
Liberal Arts Newsletters
Special Section: Collabortions. To better understand the world and to tackle its complex problems, collaboration between disciplines offers a critical path forward. Faculty research and teaching interests to give students multidisciplinary educational opportunities. In this special section, we present the latest offerings in the College—two new minors, a new integrated fine arts course, and integrated science courses—along with a glimpse of the other multidisciplinary majors and minors.
Characterization Of Charge Accommodation In Biologically Important Hydrogen-Bonded Clusters, John Thomas Kelly
Characterization Of Charge Accommodation In Biologically Important Hydrogen-Bonded Clusters, John Thomas Kelly
Electronic Theses and Dissertations
The underlying motivation of chemical physics and physical chemistry is to understand naturally occurring chemical and physical processes from the nanoscopic molecular level to the macroscopic condensed phase. Over the past half-century, experimentalists have developed a number of laser-based analytical techniques to bridge the gap between the bulk phase and the single molecule. Here, we look at bulk phase and gas phase clusters to compare the local hydrogen-bonded network. To better understand the role noncovalent interactions have on biologically relevant building blocks in a natural environment, we compare the microhydration of gas phase cluster ions to condensed phase spectra. The …
Diffusion And Invasion Percolation: A Coupled Model To Simulate The Fate Of Trapped And Compressed Gases In Partially-Saturated Low Permeability Media, Ross Berry
Electronic Theses and Dissertations
No abstract provided.
Cyclostratigraphy And Sedimentation Of The Cenomanian-Turonian Tuscaloosa Marine Shale, Christian Gilbert Kunhardt
Cyclostratigraphy And Sedimentation Of The Cenomanian-Turonian Tuscaloosa Marine Shale, Christian Gilbert Kunhardt
Electronic Theses and Dissertations
A cyclostratigraphic and geochemical analysis was conducted on the basal high resistivity zone of the Tuscaloosa Marine Shale to determine if orbital forcing is apparent in mineralogical data suites. Geochemical data suites obtained via x-ray diffraction from five cored wells located near the southern Mississippi/Louisiana border were used in the study. The results were used in concert with previously published insolation and biostratigraphic data and unpublished stable carbon isotope data to determine sedimentation rate, to identify and correlate the cretaceous oceanic anoxic event 2 (OAE 2) recovery period within the studied interval, and to determine the possible mechanisms of orbital …
Gas Exchange Of Hg Over Wetlands, Effect Of Biochar And Activated Carbon On Hg Emissions From Soil, And Seasonal Concentrations Of Hg In Rain, Divya Nallamothu
Gas Exchange Of Hg Over Wetlands, Effect Of Biochar And Activated Carbon On Hg Emissions From Soil, And Seasonal Concentrations Of Hg In Rain, Divya Nallamothu
Electronic Theses and Dissertations
Mercury (Hg) is a global pollutant with human-health and ecological impacts. Gaseous Hg exchange between the atmosphere and aquatic or terrestrial surfaces serves as an important, but not well understood, route for Hg to enter and exit ecosystems. To better understand the role of gaseous Hg exchange in the biogeochemical cycling of Hg, we investigated Hg0 fluxes over natural wetlands (Sky Lake) and artificial wetlands (UM Field Station) using a dynamic flux chamber and an Hg vapor analyzer based on atomic fluorescence (Chapter 1). We also examined the effect of activated carbon and biochar on Hg emissions from soils for …
Remobilization Of Cobalt, Copper, Nickel, Lead, And Zinc In A Riparian Wetland Model, Richard Glenn Dolly
Remobilization Of Cobalt, Copper, Nickel, Lead, And Zinc In A Riparian Wetland Model, Richard Glenn Dolly
Electronic Theses and Dissertations
The mobility of chemically persistent metals in riparian wetland systems that could have a detrimental impact on the environment is an area of active research. This study utilized a physical model consisting of open water and wetland cells designed to simulate a natural riparian wetland to examine the mobility of five metals. The objective of the study was to determine if riparian wetlands have the potential to serve as permanent sinks for metals, or if they only serve as temporary sinks and with time metals could be remobilized and released. Specifically, this study examined the long-term behavior of Co, Cu, …
Blue Cheese Cosmology: Lensing By Cosmic Strings, Jared Wofford
Blue Cheese Cosmology: Lensing By Cosmic Strings, Jared Wofford
Honors Theses
The light bending effects around cosmic strings in universes with varying rates of expansion are investigated. A relationship between the angular deflection and the expansion rate is found. This is made possible by the Blue Cheese model, which is a generalization to a cylindrical realm of the Swiss Cheese model
Study Of An Active-State Cb1 Receptor Model And Jwh Compound Interactions To Predict New Emerging Synthetic Cannabinoids, Kelsey Leigh Pettus
Study Of An Active-State Cb1 Receptor Model And Jwh Compound Interactions To Predict New Emerging Synthetic Cannabinoids, Kelsey Leigh Pettus
Honors Theses
In recent years, a new class of compounds, called synthetic cannabinoids, have made their appearance in the market as a substitute for illegal marijuana or its constituent natural cannabinoids. These compounds, which are active at the same G- protein coupled receptors (GPCRS) as cannabinoids, are continuing to gain popularity because of the same cannabinoid-like effects they create. Though two cannabinoid receptors have been identified in humans, known as CB1 and CB2, synthetic cannabinoid activity at the CB1 receptor has been the focus of much research regarding synthetic cannabinoid ligand binding. In this study, the structure of the CB1 receptor is …
Noise Reduction In The Manufacturing Environment: A Study On Small Jet Geometry Alterations, Shawn Wesley Skinner
Noise Reduction In The Manufacturing Environment: A Study On Small Jet Geometry Alterations, Shawn Wesley Skinner
Honors Theses
Noise pollution is an identified issue in manufacturing environments. While machines, motion, production, etc. are a large factor in this noise pollution, other sources exist. Often copper tubing is connected to pressurized containers as a make-shift jet stream for reorienting elements on the assembly line. These makeshift jets when working in conjunction create noise pollution. By manipulating the exit of these small jets, it is hypothesized that the noise level can be decreased. Using the National Center for Physical Acoustics (NCPA) at the University of Mississippi, three geometry alterations—deburring the end, creating a converging-diverging nozzle, and flattening the end—were tested …
Method Development Toward The Analysis Of The Functionalization Of Proteins, Victoria Calcote
Method Development Toward The Analysis Of The Functionalization Of Proteins, Victoria Calcote
Honors Theses
Calmodulin is a ubiquitous small intracellular protein that functions as a receptor for regulatory calcium signals and thus regulates a multitude of physiological processes in organisms as diverse as yeast, fruit flies, and mammals. Since its structure and function have been extensively studied, our goal is to create a calmodulin biomaterial, with the ultimate goal of in situ drug delivery or as a scaffold for stem cell growth and differentiation. We plan to create this biomaterial by using Click Chemistry, the rapid creation of new heteroatom bonds through a copper-catalyzed azide-alkyne cycloaddition. The bonds are created by treating calmodulin as …
Calculating Liquefaction Potential Of Northern Mississippi Using Shear Wave Data, Peshani Herath
Calculating Liquefaction Potential Of Northern Mississippi Using Shear Wave Data, Peshani Herath
Honors Theses
The potential for liquefaction can be determined using the Liquefaction Potential Index (LPI). The LPI takes into account the thickness of the liquefiable layers and the factors of safety with respect to depth. This study creates a hybrid method for determining the LPI for different locations in Northern Mississippi. It calculates an average CSR for the region using existing borehole information. The CRR is then calculated using shear wave velocity profile data from a MASW survey. The LPI obtained from this process is compared to LPI values calculated using CPT data and borehole shear wave data. Surface shear wave velocity …
Implementation Of An Enhanced System Of Motion Tracking For Virtual Reality Using 'Common Off-The-Shelf' Items, Sean M. O'Hara
Implementation Of An Enhanced System Of Motion Tracking For Virtual Reality Using 'Common Off-The-Shelf' Items, Sean M. O'Hara
Honors Theses
My project was tasked and guided by Dr. Adam Jones of the University of Mississippi's Computer Science Department to design and implement an improved system of infrared motion tracking for virtual reality. The enhancements allow Dr. Jones to use motion tracking for VR in ways that he previously could not, and these improvements include the ability to track multiple objects along with a foundation for expanding my project's use to work with a multiple camera setup for motion tracking. The hardware used in my project made use of Dr. Jones' supply of technology for development and research within the area …
Indolizine-Squaraine Nir Emissive Materials, Tana A. Rill
Indolizine-Squaraine Nir Emissive Materials, Tana A. Rill
Honors Theses
Near-infrared (NIR) emissive organic materials are an emerging area of study with an array of applications for both military and civilian purposes including night vision technologies, secure communications, surveillance, homing, fluoresence imaging, secure displays as NIR OLED materials, heat-blocking coatings, in vivo fluoresence biological imagaing, and additional optoelectronics device applications. We have developed a series of organic NIR emissive materials based on an indolizine donor and squaraine acceptor. The novel-to-squaraine donor, indolizine, exhibits a remarkable increase in absorption maximum wavelength when compared with benchmark indoline-based squaraine dyes (700 nm vs. 625 nm) with molar absorptivities ranging from 100,000-262,000 M-1cm-1. Emission …
Effect Of 5-Hydroxymethylcytosine Modifications On Stability Of Vegf I-Motifs, Bethany Summerford
Effect Of 5-Hydroxymethylcytosine Modifications On Stability Of Vegf I-Motifs, Bethany Summerford
Honors Theses
DNA i-motifs are a secondary structure of DNA formed at low pH by internal folding of strands rich in cytosine. This study focuses on trying to determine if the DNA from the vascular endothelial growth factor (VEGF) promoter, which can form an i-motif, can be stabilized with the epigenetic modification to 5- hydroxymethylcytosine in four separate locations on the DNA strand, and to what extent the degree of stabilization depends on the location of the modification. Stability of the i-motif was determined by measuring pKa and melting point (Tm) of each VEGF modification using circular dichroism spectroscopy. The modified samples …
Multidimensional Motion Capture Using Doppler Ultrasound, Forrest Nolan Gamble
Multidimensional Motion Capture Using Doppler Ultrasound, Forrest Nolan Gamble
Honors Theses
Ultrasonic waves are used to measure the velocity of a target object by measuring the Doppler shift of the reflected waves. In this work, ultrasonic Doppler Sonar (UDS) was used to measure the velocity of objects, including a pendulum and a battery on a turntable. The investigation focused on developing a method to measure motion in two and three dimensions, for applications in gait analysis and sports motion capture. By using multiple ultrasonic transducers and novel data processing techniques, the UDS captured motion in two and three dimensions. In order to test the accuracy of the velocity and position measurements, …
A Study On The Characterization And Implementation Of Tools For Advanced Ligo, Hunter Gabbard
A Study On The Characterization And Implementation Of Tools For Advanced Ligo, Hunter Gabbard
Honors Theses
The Laser Interferometer Gravitational Wave Observatory (LIGO) is aimed at directly detecting gravitational waves, small perturbations or ripples in the fabric of space-time. Because of their extreme sensitivity, the LIGO detectors are affected by many sources of non-astrophysical noise. In the first part of this thesis we test a pipeline designed for the identification of short-duration noise transients, called Omicron. We first inject simulated noise waveforms in engineering run data from the LIGO detector in Livingston, Louisiana and then determine Omicron efficiency by attempting to recover these injections. In the second part of this thesis, we present a novel method …
Obstacle-Aware Wireless Video Sensor Network Deployment For 3d Indoor Space Monitoring, Zhonghui Wang
Obstacle-Aware Wireless Video Sensor Network Deployment For 3d Indoor Space Monitoring, Zhonghui Wang
Electronic Theses and Dissertations
In recent years wireless video sensors networks (WVSNs) have emerged as a leading technology for monitoring 3D indoor space in campus, industrial and medical areas as well as other types of environments. In contrast to traditional sensors such as heat or light sensors often considered with omnidirectional sensing range, the sensing range of a video sensor is directional and can be deemed as a pyramid-shape in 3D. Moreover, in an indoor environment, there are often obstacles such as lamp stands or furniture, which introduce additional challenges and further render the deployment solutions for traditional sensors and 2D sensing field inapplicable …
Investigation Of Neural And Epithelial Cadherin Monomer Properties Using A Molecular Dynamics Approach, Lianyi Fan
Investigation Of Neural And Epithelial Cadherin Monomer Properties Using A Molecular Dynamics Approach, Lianyi Fan
Electronic Theses and Dissertations
Neural and epithelial cadherin are adhesion proteins intensely studied by our lab. Although the sequence, structure, and conformation are similar for the two cadherins, there are several physical properties that differ: dimerization affinity, dimerization kinetics, intermediate structure, and critical residues for dimerization. In the presence of calcium, cadherins are in equilibrium between monomeric and dimeric states, and the scope of this thesis focuses on monomeric cadherin. These molecular dynamics evaluations are based on the testing of specific hypotheses regarding the intramolecular interactions of neural and epithelial cadherin. We particularly focus on interactions involving critical residues at the N-terminus of the …
Synthesis And Characterization Of Anhydrous Proton Conducting Polymer Electrolytes For Fuel Cell Applications, Buddika Mayomi Liyanage
Synthesis And Characterization Of Anhydrous Proton Conducting Polymer Electrolytes For Fuel Cell Applications, Buddika Mayomi Liyanage
Electronic Theses and Dissertations
Anhydrous H+ ion conducting and high temperature capability of polymer electrolytes are being investigated for use in applications such as batteries, fuel cells, electro chromic windows and light emitting devices. Fuel cells are efficient electrochemical energy conversion devices; they can generate greener energy from chemical fuels. The polymer electrolyte membrane is heart of most fuel cell designs separating the oxidant and fuel chambers and providing the medium to conduct H+ ions between the anode and the cathode. Our goal is to understand the molecular level details of anhydrous H+ conductivity through the synthesis and characterization of polymer electrolytes based on …
Gold And Silver Alloy Nanoparticles: Synthesis, Characterization And Atomic Structure, Chanaka Kapila Kumara
Gold And Silver Alloy Nanoparticles: Synthesis, Characterization And Atomic Structure, Chanaka Kapila Kumara
Electronic Theses and Dissertations
Nanotechnology is an emerging field of science with applications in digital electronics, medicine, catalysis and energy. Gold nanoparticles are nanomaterials that have less than 100 nm at least in one dimension. The composition and the structure/geometry of the nanoparticles determine the chemical properties and reactivity. Modern research focus on method development in atomically monodisperse nanoparticle synthesis. This dissertation describes the method development for synthesis and isolation of atomically precise gold and gold-silver alloy nanoparticles and their comprehensive characterization and atomic structure investigation. Chapter one offers an introduction to the synthesis and isolation methods. These nanoparticles can be represented in the …
Contribution Of Shallow Geology To Hydrocarbon Seep Formation In Green Canyon Block 600, Samantha Lynn Lucker
Contribution Of Shallow Geology To Hydrocarbon Seep Formation In Green Canyon Block 600, Samantha Lynn Lucker
Electronic Theses and Dissertations
The Green Canyon Federal Protraction area in the Gulf of Mexico is rich in hydrocarbons. The movement of the Sigsbee salt escarpment in green canyon has resulted in a complex bathymetric profile and extensive shallow faulting that has allomigration of hydrocarbons to the surface creating cold seep sites. Green Canyon block 600 (gc600) contains multiple naturally occurring, active hydrocarbon seeps. Multi-beam bathymetry, backscatter, and polarity preserving chirp data were collected for gc600 to study the development of these naturally occurring seeps. Using these data, the structure and sedimentation of the first fifty meters can be studied in relation to the …