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Optimization Of Fluidized Bed Isothermal Reactor In A Styrene Production Process, Matthew Hamilton Peaster Jan 2016

Optimization Of Fluidized Bed Isothermal Reactor In A Styrene Production Process, Matthew Hamilton Peaster

Honors Theses

The focus of this thesis is to explain the optimization of a fluidized bed isothermal reactor in a styrene production process. The first section of the thesis gives a summary of chemical process optimization in general. The next portion of the thesis gives an introduction to chemical process simulation software, and it explains how simulation software aids in the design and optimization of chemical processes. The third section of the thesis gives a brief overview of an optimization project of a styrene production process that was completed in the previous semester with a group of three. The final section explains …

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The Creation Of Instructional Video Tutorials For Chemical Engineering Process Simulation Software, Nishal Bhikha Jan 2016

The Creation Of Instructional Video Tutorials For Chemical Engineering Process Simulation Software, Nishal Bhikha

Honors Theses

Process simulation software is rapidly becoming a necessity in today's world. Often, learning how to use such a complex tool can be difficult and can take a significant period of time. This thesis outlines efforts to aid in the instruction of this type of software at the University of Mississippi.

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Effect Of 5-Hydroxymethylcytosine Modifications On Stability Of Vegf I-Motifs, Bethany Summerford Jan 2016

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 …

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Anodic Metal Dissolution In Haloaluminate Molten Salts/Ionic Liquids, Chen Wang Jan 2016

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 …

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Computation Of Acoustic Ressure Fields Produced In Feline Brain By High-Intensity Focused Ultrasound, Nazanin Omidi Jan 2016

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) …

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Reducing Cache Contention On Gpus, Kyoshin Choo Jan 2016

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 …

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Independent Domination Of Subcubic Graphs, Bruce Allan Priddy Jan 2016

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.

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Critical Quality Attributes Of Topical Semi-Solid Dosage Forms: Solvent Activity, Muralikrishnan Angamuthu Jan 2016

Critical Quality Attributes Of Topical Semi-Solid Dosage Forms: Solvent Activity, Muralikrishnan Angamuthu

Electronic Theses and Dissertations

Critical quality attribute has been defined as “a physical, chemical, biological or microbiological property or characteristic that should be within an appropriate limit, range, or distribution to ensure the desired product quality”. Deviations from preset quality metrics may potentially result in drug products with inferior therapeutic efficacy and unacceptable clinical safety profile. Topical cream formulations may possess numerous quality attributes that can affect the permeation of the drug through skin and consequently therapeutic efficacy. CQAs of topical formulations are often aimed at characterizing either the physicochemical properties of APIs or bulk characteristics of the formulation itself. Solvent systems constitute a …

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Hot-Melt Extrusion: A Versatile Pharmaceutical Technology, Hemlata Patil Jan 2016

Hot-Melt Extrusion: A Versatile Pharmaceutical Technology, Hemlata Patil

Electronic Theses and Dissertations

Hot-melt extrusion (HME) is a promising technology for the production of new chemical entities in the developmental pipeline and for improving products already on the market. The first objective of this research work was to describe a continuous process for the production of solid lipid nanoparticles (SLN) as drug-carrier systems via hot-melt extrusion (HME) using Quality by Design (QbD) principles. Fenofibrate SLN were prepared by combining two processes: HME technology for melt-emulsification and high-pressure homogenization (HPH) for size reduction. Varying the process parameters enabled the production of SLN below 200 nm. At the end of a 5-h in-vitro dissolution study, …

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A Comparison Of Shovel Testing And Surface Collection As Archaeological Site Discovery Methods: A Case Study Using Mississippian Farmsteads, Cameron Smith Howell Jan 2016

A Comparison Of Shovel Testing And Surface Collection As Archaeological Site Discovery Methods: A Case Study Using Mississippian Farmsteads, Cameron Smith Howell

Electronic Theses and Dissertations

Shovel testing and controlled surface collection are commethods of archaeological site investigation that are generally approved by state and federal agencies as well as the academic community for cultural resource management projects and research. While both techniques are equally utilized, little research has been conducted on how equivalent these techniques are in terms of their efficacy for finding site. This thesis seeks to find a way to compare these techniques by creating mathematical models to describe how well the methods behave when tested on known datasets generated from Mississippian period farmsteads. The predicted performance can then be compared to real …

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Localization And Mapping Of Unknown Locations And Tunnels With Unmanned Ground Vehicles, Doris Turnage Jan 2016

Localization And Mapping Of Unknown Locations And Tunnels With Unmanned Ground Vehicles, Doris Turnage

Electronic Theses and Dissertations

The main goals of this research were to enhance a commercial off the shelf (COTS) software platform to support unmanned ground vehicles (UGVs) exploring the complex environment of tunnels, to test the platform within a simulation environment, and to validate the architecture through field testing. Developing this platform will enhance the U. S. Army Engineering Research and Development Center’s (ERDC’s) current capabilities and create a safe and efficient autonomous vehicle to perform the following functions within tunnels: (1) localization (e.g., position tracking) and mapping of its environment, (2) traversing varied terrains, (3) sensing the environment for objects of interest, and …

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Rain Induced Runoff Simulation Using A 2d Numerical Model, Tahmina Shirmeen Jan 2016

Rain Induced Runoff Simulation Using A 2d Numerical Model, Tahmina Shirmeen

Electronic Theses and Dissertations

Runoff plays an important role in the agricultural and urbanized environments. Surface runoff is determined primarily by the amount of precipitation and by infiltration characteristics related to soil type, soil moisture, antecedent rainfall, land cover type, impervious surfaces, and surface retention. In this study, CCHE2D, a numerical model for free surface flow hydrodynamics, is applied to study the rain induced runoff and channel flow mixed problems. The main goal of this study is to incorporate rainfall as an input into the existing free surface flow model, CCHE2D; to verify and validate the CCHE2D model’s runoff simulation capability using analytical solutions …

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Remobilization Of Cobalt, Copper, Nickel, Lead, And Zinc In A Riparian Wetland Model, Richard Glenn Dolly Jan 2016

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, …

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On Topological Indices And Domination Numbers Of Graphs, Shaohui Wang Jan 2016

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 …

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Development Of A Dynamic Coupled Hydro-Geomechanical Code And Its Application To Induced Seismicity, Md Mamun Miah Jan 2016

Development Of A Dynamic Coupled Hydro-Geomechanical Code And Its Application To Induced Seismicity, Md Mamun Miah

Electronic Theses and Dissertations

No abstract provided.

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Bacteria Prediction For Recreational Waters Through The Use Of Artificial Neural Networks, Christopher Douglas Jan 2016

Bacteria Prediction For Recreational Waters Through The Use Of Artificial Neural Networks, Christopher Douglas

Electronic Theses and Dissertations

Many scientists and government agencies rely on Fecal Indicator Bacteria (FIB) to determine the risk of exposure to pathogens in water. If there is a presence of these indicator bacteria, pathogenic microorganisms may also be present. These bacteria in recreational water bodies pose a health threat to people if ingested during activities such as swimming or from the consumption of marine life. The most commonly tested FIBs are total coliforms, Fecal coliforms, Escherichia coli, Fecal streptococci, and enterococci. The measurement of bacteria can be time consuming (up to 48 hours) and expensive, creating a difficulty in warning the public of …

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Employee Benefit Plans Industry Developments - 2016; Audit Risk Alerts, American Institute Of Certified Public Accountants (Aicpa) Jan 2016

Employee Benefit Plans Industry Developments - 2016; Audit Risk Alerts, American Institute Of Certified Public Accountants (Aicpa)

Industry Guides (AAGs), Risk Alerts, and Checklists

No abstract provided.

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Rhenium-Pyridyl-Nhcs For Photocatalytic Co2 Reduction, Emily Anne Sharpe Jan 2016

Rhenium-Pyridyl-Nhcs For Photocatalytic Co2 Reduction, Emily Anne Sharpe

Honors Theses

The ability to transform CO2 into a useable fuel source would have a remarkably positive impact on the environment by taking the vast amounts of previous unusable CO2 from the atmosphere and reducing it to CO, which can then be turned into fuel. This project involves the synthesis and testing of air and water stable Re (I) pyridyl N- heterocyclic carbene (NHC) compounds for photocatalytic reduction of CO2 into CO using a simulated solar spectrum. Previous research in this area focused on the use of Re(bpy)CO3X, which quickly became the benchmark of homogeneous CO2 reduction photocatalysts. The Re (I) pyridyl …

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Blue Cheese Cosmology: Lensing By Cosmic Strings, Jared Wofford Jan 2016

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

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The Synthesis Of Substituted Pentadentate Ligand Scaffolds And Their Future Application In Ruthenium-Catalyzed Water Oxidation, Manpreet Singh Jan 2016

The Synthesis Of Substituted Pentadentate Ligand Scaffolds And Their Future Application In Ruthenium-Catalyzed Water Oxidation, Manpreet Singh

Honors Theses

Rising global energy demands coupled with depleting natural resources have led to a strong emphasis on finding new sources of energy that are renewable and which limit the negative impact on the environment. One of the strongest candidates is utilizing solar energy to drive water oxidation to produce hydrogen as a fuel source. In order to do this, a better understanding of the mechanism involved in this process must be revealed. Homogenous molecular catalysts allow mechanistic studies and can be also used in Photoelectrochemical Cells (PECs) and other systems to produce chemical fuels. In this work, the new syntheses of …

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The Evolution Of The Sugarcoated American Food Market And The Paradox Of Artificial Sweeteners, Mary Moses Hitt Jan 2016

The Evolution Of The Sugarcoated American Food Market And The Paradox Of Artificial Sweeteners, Mary Moses Hitt

Honors Theses

Living in present-day America makes it hard to imagine an era when sugar was not as inexpensive and readily available as it is now. It is in little colorful packets on restaurant tables, filled to the brim in jars at coffee shops, or mixed into candy products located at the beginning of every cash register. Today, sugar is one of, if not, the most widely consumed food products in the world, but our love for sugar is nothing new. Humans have been experiencing the bliss triggered by sweet-tasting foods since their earliest diets, which included fruits and honey. Our diets …

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Is Accounting For Stock Options Manipulated Before And After An Initial Public Offering?, Natalie Marie Flood Jan 2016

Is Accounting For Stock Options Manipulated Before And After An Initial Public Offering?, Natalie Marie Flood

Honors Theses

Stock option accounting is an area in financial statements that requires substantial estimates and management discretion. Previous research in the area of stock option accounting has found that valuations of options and subsequent accounting methods have been incorrectly stated to aid a company to look financially stronger. Companies that are about to undergo an initial public offering have the most incentive to incorrectly state the value of their options. However, all of these studies have used financial data from financial statements dated before 2004. This is significant because FASB Standard 123(R) (2004) and the Sarbanes-Oxley Act (2000) have both been …

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Paleosol Development And Trace Fossils In The Upper Triassic Cooper Canyon Formation Of The Dockum Group In Andrews County, Texas, Michael Charles Gratzer Jan 2016

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 …

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Calculating Liquefaction Potential Of Northern Mississippi Using Shear Wave Data, Peshani Herath Jan 2016

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 …

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Implementation Of An Enhanced System Of Motion Tracking For Virtual Reality Using 'Common Off-The-Shelf' Items, Sean M. O'Hara Jan 2016

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 …

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It's About Time: The Effectiveness Of Time Perception As A Measurement Of Cognitive Load, Victoria Robinson Jan 2016

It's About Time: The Effectiveness Of Time Perception As A Measurement Of Cognitive Load, Victoria Robinson

Honors Theses

This study examines the effectiveness of time perception as a measurement of cognitive load. The purpose of this research is to determine whether the concept of time perception can efficiently indicate high or low cognitive load in a task, and to compare this measurement to the standard mental effort rating scale that is typically used to measure cognitive load. In this study, participants completed both simple and complicated math problems at their own pace. After they were told to stop, participants either rated their level of mental effort used in the task, or wrote down how long they believed it …

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The Theoretical Argument For Disproving Asymptotic Upper-Bounds On The Accuracy Of Part-Of-Speech Tagging Algorithms: Adopting A Linguistics, Rule-Based Approach, William Foley Jan 2016

The Theoretical Argument For Disproving Asymptotic Upper-Bounds On The Accuracy Of Part-Of-Speech Tagging Algorithms: Adopting A Linguistics, Rule-Based Approach, William Foley

Honors Theses

This paper takes a deep dive into a particular area of the interdisciplinary domain of Computational Linguistics, Part-of-Speech Tagging algorithms. The author relies primarily on scholarly Computer Science and Linguistics papers to describe previous approaches to this task and the often-hypothesized existence of the asymptotic accuracy rate of around 98%, by which this task is allegedly bound. However, after doing more research into why the accuracy of previous algorithms have behaved in this asymptotic manner, the author identifies valid and empirically-backed reasons why the accuracy of previous approaches do not necessarily reflect any sort of general asymptotic bound on the …

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High Frequency Trading 101: Regulatory Impact In American And European Markets, Yasmine Elisabeth Allen Jan 2016

High Frequency Trading 101: Regulatory Impact In American And European Markets, Yasmine Elisabeth Allen

Honors Theses

High frequency trading has impacted the American and European financial markets through its advanced algorithms, rapid speed, and preferential treatment from purchasing information and co-location from exchanges. High frequency trading alone is not harmful, but without proper regulations it can hurt the financial markets. In this thesis, I researched implemented regulations, the consequences of those regulations, and pending new regulations. To gather information, I studied relevant research on the topic, including numerous academic articles and books to get a broader view of the issues. Through my research, I have found that previous regulations implemented by American and European regulatory agencies …

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A Framework For Verification Of Signal Propagation Through Sequential Nanomagnet Logic Devices, Alexander Gunter Jan 2016

A Framework For Verification Of Signal Propagation Through Sequential Nanomagnet Logic Devices, Alexander Gunter

Honors Theses

Nanomagnet Logic is an emerging technology for low-power, highly-scalable implementation of quantum-dot cellular automata. Feedback permits reuse of logical subroutines, which is a desired functionality of any computational device. Determining whether feedback is feasible is essential to assessing the robustness of nanomagnet logic in any pipelined computing design. Therefore, development of a quantitative approach for verification of feedback paths is critical for development of design and synthesis tools for nanomagnet logic structures. In this paper, a framework for verification of sequential nanomagnet logic devices is presented. A set of definitions for canonical alignment and state definitions for NML paths are …

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An Exploration Of Modern Financial Reporting, Jane C. Case Jan 2016

An Exploration Of Modern Financial Reporting, Jane C. Case

Honors Theses

The following are solutions to a series of case studies in financial reporting completed in fulfillment of the requirements of the honors ACCY 420 course at the University of Mississippi for both the fall and spring semester of the 2015/2016 academic year. Each case study focused on a particular area of financial reporting for a specific company or set of companies in the same industry. Each case contained a problem set requiring comprehension of accounting concepts, analysis of financial stability, mathematical calculations, and preparation of journal entries and financial statements.

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