Digital Commons Network^™

Comparison Between Numerical, Analytical, And Field Solutions With Experimental Data For 90º Open Channel Junctions, Ahmed Zahran, Tamer A. Gado, Ebrahim Rashwan

Journal of Engineering Research

Junction in open channel flow points out any side water secession from natural or artificial channels. In the last decades, comprehensive theoretical and experimental investigations on the dividing flow in open channel junctions have been executed to understand the characteristics of this separating flow. In this research, a three-dimensional turbulence model by fluent software used to replicate the flow characteristics of a 90º open channel junctions for two geometries. One is with equal width and horizontal bed and the other is field canal junction with irregular section. The modeling is based on the Navier-Stokes equation and κ-ω turbulent model. Comparing …

Research Instrumentation Center (Ric), Ryan Hilger, Purdue University Office Of Research

University Research Core Facility Boilerplate Descriptions

No abstract provided.

Law School News: Dean Bowman On The Scotus Admissions Decision 6-29-2023, Gregory W. Bowman

Life of the Law School (1993- )

No abstract provided.

The (Un)Welcome Stranger: Intercultural Sensitivity In Six American Novels, Jeff Morgan

Faculty and Staff Publications & Presentations

My research explores the level of inclusivity in fictional communities in six classic American novels: Herman Melville’s Moby-Dick, Nathaniel Hawthorne’s’ The Scarlet Letter, Sarah Orne Jewett’s The Country of the Pointed Firs, Henry James’ The American, Ralph Ellison’s Invisible Man, and Ernest Hemingway’s For Whom the Bell Tolls. It also measures the intercultural sensitivity in fictional characters in these communities, focusing on characters who are deemed different in these communities as well as those who represent the status quo in those communities. The cultural interactions, the conflicts that occur in these novels, serve as models when viewed under the lens …

Mapping Per- And Polyfluoroalkyl Substances (Pfas) In South Carolina Surface Waters: Are There Hotspots?, Thomas C. Geiger

Senior Theses

Per- and polyfluoroalkyl substances (PFAS) are synthetic chemicals used in consumer products for their unique chemical properties. PFAS compounds are resistant to water, oil, heat, and grease, making them useful for a wide variety of everyday items such as non-stick cooking pans, food packaging, electronics, carpets, upholstery, paints, adhesives, and personal care products.¹ The resilient nature of PFAS has made these compounds immensely popular with consumers but has since been considered a potential environmental and public health hazard for their ability to bioaccumulate and for their stability in the environment. More than 6000 PFAS have been discovered in the …

Quantitation Of Female Newt Tetrodotoxin Concentrations And Their Impact In The Newt-Garter Snake Evolutionary Arms Race, Anna Frey, David Green Dr., Lee Kats Dr., Gary Bucciarelli Dr.

Seaver College Research And Scholarly Achievement Symposium

As this work is not yet published, the authors have requested the removal of the abstract.

Control Mapping Methodology For Tailless Morphing-Wing Aircraft, Zachary S. Montgomery

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Advanced aircraft designs tend to have several control surfaces or devices that affect the flight of the aircraft. It is difficult or even impossible for a pilot to directly control each of these devices and fly the aircraft well. Therefore, a control mapping logic is needed to take typical pilot commands and map them to what the control devices should do to achieve the pilot’s commands. This work presents a methodology for determining this control mapping logic using two different approaches. The first uses a theoretical approach based on lifting-line theory, while the second leverages computational methods. The methodology consists …

Are Conspiracy Beliefs Induced By Thinking Disposition And Economic Uncertainty?, Sean E. Yilmaz

Undergraduate Honours Theses

Belief in conspiracy theories since 2020 resulted in widespread protests towards governments attempting to mitigate the pandemic. In times of uncertainty, it is not uncommon for conspiracy beliefs to rise in popularity. However, not everyone who finds themselves in a state of uncertainty about the future holds conspiracy beliefs. Higher analytical thinking skills and lower intuitive thinking skills have been correlated with lower acceptance of conspiracy beliefs. In an era of uncertainty, factors such as analytical thinking may provide the ability to discern conspiracy beliefs from reality. Hence, in this study, feelings of uncertainty and thinking disposition (analytical vs. intuitive) …

High Performance Liquid Chromatography Monitoring Reaction Kinetics, Ken Overway, Mary Ruth Shifflett

Chemistry Faculty Scholarship

To develop a chromatographic method to characterize enantioselective kinetics, the reaction between aromatic aldehydes and ephedrine will be monitored with High Performance Liquid Chromatography (HPLC). First, develop kinetics analysis procedure with the HPLC, the decomposition of aspartame was observed with citrate and phosphate buffers. The procedure produced an activation energy in the presence of phosphate buffer of 71.9 kJ/mol with a -0.126 % error. The aromatic aldehyde, benzaldehyde, and ephedrine were run through a stereospecific column to separate peaks with various mobile phases. A more nonpolar mobile phase is required for better peak and retention time separation.

Investigation Of The Analytical Utility Of The Inductively Coupled Plasma Mass Spectrometer (Icp-Ms) For The Quantification Of Proteins Via Lanthanide Labeling, Caitlin Elizabeth Dunlap

Undergraduate Honors Thesis Collection

The discovery and ability to provide an absolute concentration of biomarkers in the body can facilitate early diagnoses of diseases. This information can also be used for more accurate and unique treatments for those patients. While major advances in molecular mass spectrometry allows for a sensitive identification of these biomarkers, they are limited to only four orders of magnitude in their dynamic ranges. Due to this, detection and quantitation of low abundant proteins, which tend to make up these vital biomarkers, is very difficult. On the other hand, ICP-MS offers a wider dynamic range (up to 12 orders of magnitude) …

Investigating Ionic Current Rectification As A Means Of Controllable Drug Delivery Using Silica Nanoparticles And Nano Porous Membranes, Katie L. Nolan

Honors College Theses

This project investigates a novel ionic current rectification (ICR) phenomenon created by the opening and closing of nanopores by charged silica nanoparticles (SNPs) under electrophoretic flow. This voltage-controlled opening and closing of the pores can be exploited to allow delivery of nicotine through the pores at programmable intervals. The ICR phenomenon was thoroughly investigated by varying pH, buffer concentration, SNP concentration, and applied voltage range. The mechanism was also verified by testing with a 2-, 3-, and 5-electrode system. Potential cake layer formation was demonstrated in a longer ICR test, and the implications of this on the drug delivery mechanism …

Analysis Of The Headspace Gases Formed From The Fermentation Of Barley, Ken Overway, Cassie Taylor

Chemistry Faculty Scholarship

Volatile compounds are compounds that can exist in a gaseous state at room temperature. These compounds contribute to the aromas that are associated with mixtures. The analysis of these gases can be completed using a gas chromatograph to provide a sort of fingerprint identification. The analysis of the volatile compounds for barley fermentation samples was completed by collecting the gas above the fermenting solution, the headspace gas, and injecting this gas into the gas chromatograph. These fermentation samples showed predominantly the formation of carbon dioxide for a significant length of time before finally ethanol was detected. A subsequent of the …

Identification And Quantification Of Atrazine In The North River Using Spe And Hplc, Kenneth Scott Overway, Youmna Moawad

Chemistry Faculty Scholarship

High-performance liquid chromatography (HPLC) is utilized for the separation, purification, and quantification of viscous and complex analyte mixtures. It is important in that it can analyze and detect low analyte concentrations, which can be useful in many industries, such as food and pharmaceutical industries, as well analyzing environmental samples. The purpose of this project was to identify and quantitate atrazine, an herbicide, in a water sample from the North River (Bridgewater, VA) using solid-phase extraction (SPE) and HPLC.

Extraction & Purification Of Ppix Using Hplc & Fplc, Ken Overway, Grace Rilee

Chemistry Faculty Scholarship

Porphyrins, an organic molecule, are a possible sensitizer for dye-sensitized solar cells (DSSC) because of their strong absorption in the visible spectrum. One naturally occurring porphyrin is protoporphyrin IX (PPIX), which can be found in brown eggshells. There are two reasons why PPIX is the ideal sensitizer. (1) The absorbance spectrum of PPIX can be modified by changing ring substituents, thus tuning the absorbance to the solar spectrum. (2) PPIX allows for direct attachment to the DSSC due to the carboxylic acid substituents on PPIX and the TiO₂ of the DSSC. The HPLC was used to develop a chromatographic …

Law Library Blog (January 2021): Legal Beagle's Blog Archive, Roger Williams University School Of Law

Law Library Newsletters/Blog

No abstract provided.

The Analytical And Biomedical Applications Of Carbon Dots And Their Future Theranostic Potential: A Review, Sukunya Ross, Ren-Siang Wu, Shih-Chun Wei, Gareth M. Ross, Huan-Tsung Chang

Journal of Food and Drug Analysis

In recent years, carbon dots (C-dots) have gained appreciable interest owing to their unique optical properties, including tunable fluorescence, stability against photobleaching and photoblinking, and strong fluorescence. Simple and low-cost hydrothermal and electrochemical approaches have been widely used in the preparation of biocompatible and high-quality C-dots. Various C-dots have been used for the quantitation of small analytes, mostly based on analyte induced fluorescence quenching. Depending on the nature of precursors, synthetic conditions (such as reaction temperature and time), and surface conjugation, multi-function C-dots can be prepared and used in diagnostics and therapeutics. Their strong fluorescence and photostability, enables use in …

Design And Synthesis Of Fluorescent Silica Nanoparticle Conjugates For Metal Ion Sensing Applications, Hank Deuermeyer

Master's Theses

A novel series of fluorescent nanoparticle conjugates were designed and synthesized for the selective turn-off sensing of low concentrations of Cu2+ ion (nM-μM) in 2:1 ethanol:10 mM HEPES (pH 7). Silica nanoparticles (~250 nm) were modified with heterobifunctional polyethylene glycol (PEG) linkers and a third generation PAMAM dendron to function as chelator for Cu2+ ions. The organic dye fluorescein isothiocyanate (FITC) was subsequently conjugated to the dendron to act as a fluorescent sensitizer for the nanoparticle that is quenched upon the binding of Cu2+. Fluorescent nanoparticle conjugates using third and fourth generation PAMAM dendrimers (SNP-G3-FITC and SNP-G4-FITC) were synthesized for …

A Comparative Analysis Of Biomass Gasification Temperature Effect To Gasification Performance, Shuichi Torii

Manipal Journal of Science and Technology

Raw biomass could be converted into valuable chemicals or other high-value gases with biomass gasification technique. Considering the complexity resulting from many chemical reactions involved, it is necessary to model the gasification process. The analytical, numerical, and experimental method has been performed to build a comparative analysis in this research. The effect of temperature from biomass gasification design and operating parameters varied against the gasifier’s performance (syngas mass fraction, efficiency, and syngas calorific value). The analytical method was performed with a thermodynamic equilibrium model to assess the performance of the biomass gasifier. Global gasification reaction using zero-dimensional model approach was …

Law Library Blog (January 2020): Legal Beagle's Blog Archive, Roger Williams University School Of Law

Law Library Newsletters/Blog

No abstract provided.

Exploring The Multiplex Detection Capabilities Of Raman Spectroscopy On Mock Street Samples Containing Illicitly Manufactured Fentanyls, Mia Laverne Williams Burnett

Browse all Theses and Dissertations

Illicitly manufactured fentanyls (IMFs) have become a global and local epidemic and have recently caused an increase in the number of accidental exposures and overdoses in first responders and the community. The aim of the research is to explore a method to discriminate between IMFs and cutting agents in mock street samples using Raman Spectroscopy. Predominant Raman bands corresponding to the structural moieties of each individual illicit, licit drugs, and cutting agents were tracked, then used to discriminate between varying components in a mock street sample. In conclusion, discrimination between the components in the mixture was obtained using Raman Spectroscopy. …

Kinetics Of Mashing In Beer Brewing Process, Ken Overway, Austin Reed

Chemistry Faculty Scholarship

The process called mashing, which steeps malted grain in water at specific temperatures in order to optimize enzymatic sugar production, is critical for the beer brewing process. Each kind of grain used to make beer could have unique optimal mashing temperatures since the α- and β-amylase enzymes that produce the sugars are a result of genetic differences. Beer has mainly been brewed with barley, wheat, rye, and less common grains such as corn and rice. Gluten free beer options are very limited, and this is problematic for those suffering from Celiac disease. Quinoa is the focus grain of this project …

Comparison Of Different Base Flow Separation Methods And Drought Vulnerability In A Rift Valley Area

Journal of Spatial Hydrology

Estimation of groundwater recharge and drought vulnerability assessment was done by comparing Recursive Digital Filtering (TIMESPLOT) and Graphical Hydrograph Separation (HYSEP) methods. In both methods, long term daily stream flow data (1991 - 2003) was used from seven river discharge gauging stations in three physiographic settings (rift, escarpment and highland) and corresponding variable climatic conditions. The results from both methods have similar trend and show general agreement on annual basis with a correlation coefficient of 0.994. Moreover, long-term rainfall-discharge relationship of the sub-basin shows 0.75 correlation. The long term annual weighted catchment recharges are 94.9 mm and 111.9 mm for …

Subversive Insurgence: An Analytical Model, Compton E. Ward

Naval War College Review

Subversive insurgency is characterized by instability and change. Ill defined cause and effect relationships are generated buy the violent interaction of political, military, social, psychological, and economic factors.

Development Of Chemical Separation Methods Using Transition Metals For Nuclear Forensic And Medicinal Applications, Lucas Peter Boron-Brenner

UNLV Theses, Dissertations, Professional Papers, and Capstones

Insufficient data exists on the effects of prompt fast neutron activation on metals found commonly in nuclear devices and the urban environment. Different metals such as Ti, Au, Fe, and Cu were activated using the Flattop Criticality Benchmark at the Device Assembly Facility on the Nevada Test Site using a known neutron spectrum and flux to determine a baseline cross section value. Cross section information gathered from these neutron activation measurements could provide information that helps government and law enforcement agencies to correctly trace the origin of a nuclear device’s fuel or component features.

Based on activation products produced in …

Analysis Of The Shock Response Spectrum And Resonant Plate Testing Methods, William Larsen

Dissertations, Master's Theses and Master's Reports

Intricacies of the shock response spectrum were discovered and investigated by testing a circular plate structure with integral damping. Effects on the SRS from physical alterations to the nonlinear structure were monitored from low and high shock impulses. A method was developed and validated to estimate high amplitude shock inputs from low amplitude frequency response functions. Finite element models explored variable thickness plate designs.

Characterization And Mechanisms Of Anthocyanin Degradation And Stabilization, Nathan Blaine Stebbins

Graduate Theses and Dissertations

Anthocyanins (ACYs) are polyphenol compounds found in nature, which contribute vivid colors to many fruits and vegetables, while also possessing significant health benefits. These pigments range in color from orange-red to blue-violet and could serve as natural colorants to replace artificial additives. There is a great demand from consumers to have fewer artificial compounds in their foods. However, the relatively instability of ACYs must be further understood in order to limit color degradation before they can completely replace synthetic colorants.

ACYs slowly degrade over time, but there is a knowledge gap on their fate and mechanisms causing degradation. In order …

Determination Of Metal Concentrations In Sediments Of Big Walnut Creek, Hayley Quinn, Joan M. Esson, Kierra M. Lathrop, Michael A. Hoggarth, Kevin Svitana, Nathan Hess

Undergraduate Distinction Papers

The freshwater mussel populations in the lower stretch of Big Walnut Creek in central Ohio have been found to vary along the run of the creek with the lowest population of mussels in the middle stretch. One possible cause for the decline is the presence of contaminants in the sediments of the creek. In this study, nine Sites along the creek were examined. At each Site, sediment samples from a pool region and two quadrants from where mussels were also studied (the area of interest) were collected, along with pseudo feces, which is the waste mussels produce as they filter …

Law Library Blog (February 2017): Legal Beagle's Blog Archive, Roger Williams University School Of Law

Law Library Newsletters/Blog

No abstract provided.

Improvement And Development Of Analytical Forensic Methods: Arson Investigation And Drug Detection In Fingerprints And Hair, Sarah Anne Glenn

Electronic Theses and Dissertations

Forensic science is the cornerstone of criminal investigations. Due to the overexposure of forensic science in the media, the true nature of forensic science is often overlooked. Forensic science is a rigorous exacting science that applies methods developed in the wider scientific community to the analysis of evidence collected from crime scenes. As far back as the 6th century people were using forensics to solve crimes. Since then the science behind forensic science has increased exponentially with new methods being researched and developed. This research aims to address two of the larger subsections of forensic science, arson and drug detection. …

An Analytical Study Of The Britten Violin Concerto, Op.15, Shr-Han Wu

Theses and Dissertations

Benjamin Britten is known for his opera, vocal and symphonic works. His violin concerto was composed around the time of the second world war. During that time, there were many great violin works produced by composers such as Prokofiev, Shostakovich, Barber, etc., and their violin concertos are still considered staples of the violin repertoire. However, Britten’s violin concerto is not performed as often as other twentieth-century violin concertos. Although the popularity of his violin concerto is increasing in recent years, there is relatively little scholarly work devoted to it. The goal of this paper is to provide guidelines for performers …