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2018

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On Myth & Music, Legend & Landscape, Science, Stars, & Story; A Portfolio Of Compositions: An Animist Aesthetic Argument On Symbolist Sound-Synergies, With Musings On Messiaen And The Taoism Of Takemitzu, In The Work Of Mulvany., Eoin Mulvany Jan 2018

On Myth & Music, Legend & Landscape, Science, Stars, & Story; A Portfolio Of Compositions: An Animist Aesthetic Argument On Symbolist Sound-Synergies, With Musings On Messiaen And The Taoism Of Takemitzu, In The Work Of Mulvany., Eoin Mulvany

Doctoral

The accompanying portfolio contains eight major works for disparate forces: Brú na Sídhe is a work for Large Orchestra; Bog Bodies is a work commissioned for a heterogenous Quintet; Gáeth Ard Úar is a work written for a Solo Bass/Contrabass Clarinet in B-flat; a Piano Trio, SzyzygyS, follows; a work entitled Blackwater is written for Solo Guitar; a diptych, named Sigil, written for a Dectet of Harp and Vibraphone with double String Quartet, follows; then, O Unworn World for a ten part Choral ensemble is presented as a meditation on a poem by Patrick Kavanagh; and, the last of the …

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Attaining Scientific Literacy Through A Rhetoric Of Science Composition Pedagogy, Stephen C. Smith Jan 2018

Attaining Scientific Literacy Through A Rhetoric Of Science Composition Pedagogy, Stephen C. Smith

Electronic Theses and Dissertations Archive

For the past sixty years, acquiring scientific literacy has proven to be a daunting task in education, especially for undergraduate nonscience majors. Although some education scholars have recognized the importance and use of arguments to teach science, these pedagogical practices often are aimed at primary school children rather than college students or involve reporting science experiments rather than actually studying or constructing arguments about issues related to science.However, in this dissertation, I contend that educators often neglect a more available tool that not only examines arguments concerning scientific issues but also demonstrates the very heart of scientific literacy: critical thinking. …

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Essays In Finance, Management, And Real Estate, Minxing Sun Jan 2018

Essays In Finance, Management, And Real Estate, Minxing Sun

Electronic Theses and Dissertations Archive

This dissertation presents three papers in three different areas: finance, management and real estate. The first essay investigates whether CEO gender influences the likelihood of dismissal. We theorize and find that, ceteris paribus, female CEOs are significantly more likely to be dismissed than male CEOs. Perhaps even more importantly, we find a CEO gender by firm performance interaction such that male CEOs are less likely to be dismissed when firm performance is high (compared to when it is low), whereas female CEOs have a similar level of dismissal likelihood regardless of firm performance. The second essay illustrates that managers strategically …

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Essays On Collaboration Between Local Health Departments And Non-Profit Hospitals As A Path To Improve Population Health, Oluwaseyi Isehunwa Jan 2018

Essays On Collaboration Between Local Health Departments And Non-Profit Hospitals As A Path To Improve Population Health, Oluwaseyi Isehunwa

Electronic Theses and Dissertations Archive

Collaboration between local health departments (LHDs) and nonprofit hospitals around community health needs assessment (CHNA) is recognized as a key strategy to improve U.S. population health. This dissertation presents three studies on collaboration between LHDs and nonprofit hospitals around CHNA. The specific aims were to 1) examine whether collaboration between LHDs and nonprofit hospitals around CHNA is associated with community health outcomes, 2) examine the dimensions of collaboration between LHDs and nonprofit hospitals around CHNA that are associated with community health outcomes, and 3) explore the perceptions of facilitators and barriers to effective collaboration, between LHDs and hospitals. Data came …

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Source Attribution, Antibiotic Resistance And Virulence Properties Of Salmonella Serotypes Isolated From Clinically Diagnosed Human Salmonellosis Cases From Tennessee, Nabanita Mukherjee Jan 2018

Source Attribution, Antibiotic Resistance And Virulence Properties Of Salmonella Serotypes Isolated From Clinically Diagnosed Human Salmonellosis Cases From Tennessee, Nabanita Mukherjee

Electronic Theses and Dissertations Archive

Non-typhoidal Salmonella (NTS) infection is one of the major causes of diarrheal disease throughout the world. Recently, an increase in trend of human S. Newport, S. Javiana, and S. Mississippi infection has been observed in Tennessee. The exact reason for the increase of the NTS infection by these three serotypes is not known. The sources of human S. Javiana infections are not well characterized. This study performed a systematic literature review to identify potential sources of human S. Javiana infection based on available scientific evidence. This study identified the food (such as tomatoes, watermelons, paprika-spice, and cheese), drinking well water, …

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Leonard Falcone: Artist, Conductor, Pedagogue, Geoffrey Durbin Jan 2018

Leonard Falcone: Artist, Conductor, Pedagogue, Geoffrey Durbin

Electronic Theses and Dissertations Archive

This document explores Dr. Leonard Falcones impact on euphonium playing in the United States as both a teacher and an advocate of the instrument. A Sicilian-born immigrant, Falcone spent forty years as director of bands at Michigan State University and euphonium and tuba professor. As a baritonist, Falcone earned early praise for his technique and musicianship from notable figures in the wind band community such as John Philip Sousa and Edwin Franko Goldman. His commercial recordings were groundbreaking and influenced generations of performers and composers. As a studio instructor, Falcones teaching style was decades ahead of its time as his …

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Middle School Teachers Perceptions Of The Factors That Support Or Impede The Inclusion Of Reading Strategies Into Classroom Instruction, Angelica S. Burks-Henley Jan 2018

Middle School Teachers Perceptions Of The Factors That Support Or Impede The Inclusion Of Reading Strategies Into Classroom Instruction, Angelica S. Burks-Henley

Electronic Theses and Dissertations Archive

This interpretive case study took place in an urban middle school where content area math and science teachers engaged in content area reading instruction designed to promote students reading development in their content area classes. Participants included eight teachers across grade levels six, seven and eight. Teachers participated in a Background Information Questionnaire designed to obtain their perceptions, literacy beliefs and literacy practices; focus group interviews created to explore their perceptions related to the key themes in the literature regarding content area reading instruction; structured one-on-one interviews to corroborate researcher interpretations of the initial data analysis and to collect individual …

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Understanding Why Women Stay: Examining Persistence Factors Of Women Majoring In Science And Technology Programs In Public Ethiopian Universities Using A Mixed Methods Design, Meseret Hailu Jan 2018

Understanding Why Women Stay: Examining Persistence Factors Of Women Majoring In Science And Technology Programs In Public Ethiopian Universities Using A Mixed Methods Design, Meseret Hailu

Electronic Theses and Dissertations

Amongst African nations, Ethiopia is a unique case in many respects. The country has the second largest population on the continent, is currently experiencing an economic boom, and is a relatively stable nation in the geopolitically volatile "Horn of Africa" region. In the past two decades, the higher education sector in Ethiopia has experienced rapid growth, as evidenced by an increase in both student enrollment and the number of universities. Amongst the various types of higher education institutions, public universities are especially important because they receive the greatest financial support from the Ministry of Education. Moreover, science and technology programs …

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Investigating Inquiry-Based Learning: Teachers Perspectives At A K-12 School, Rezaul Chowdhury Jan 2018

Investigating Inquiry-Based Learning: Teachers Perspectives At A K-12 School, Rezaul Chowdhury

Electronic Theses and Dissertations Archive

Inquiry-based learning (IBL) is receiving a lot of attention and consideration as a modern instructional method. Teaching strategies that actively involve students in the learning process through inquiry instructions are more likely to increase conceptual understanding than of strategies that rely on more passive techniques. The purpose of this study is to better understand how a selected group of five teachers perceive and practice inquiry-based learning (IBL) as an instructional method in their classrooms across all disciplines at one K-12 school. This study employed a case study methodology to better understand teachers perceptions, practices, and technology integration, while using IBL …

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Commencement 2018 (Program And Video), Illinois Wesleyan University Jan 2018

Commencement 2018 (Program And Video), Illinois Wesleyan University

Commencement Ceremonies

The recording embedded here was posted to YouTube by University Communications without the remarks of Kirk S. Schroeder '84, honorary doctorate recipient. A recording of that portion of the ceremony is available in the University Archives.

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Urban School Leadership Preparation Programs' Key Factors For Developing School Leaders: What Are The Key Factors Urban School Leadership Preparation Programs Use To Develop School Leaders?, Leviticus Se'cret Pointer Jan 2018

Urban School Leadership Preparation Programs' Key Factors For Developing School Leaders: What Are The Key Factors Urban School Leadership Preparation Programs Use To Develop School Leaders?, Leviticus Se'cret Pointer

Electronic Theses and Dissertations Archive

AbstractPointer, Leviticus SeCret. Ed.D. The University of Memphis. December, 2018. Urban School Leadership Preparation Programs Key Factors for Developing School Leaders: What are the key factors Urban School Leadership Preparation Programs use to develop school leaders? Major Professor: Dr. Beverly Cross.This research was designed to identify key factors that are essential for urban school leadership preparation by conducting research, developing proven urban school leadership competencies, and for improving urban school leadership practices which enhance student learning, development and achievement. There was a secondary purpose for this research in determining if culturally relevant leadership practices were utilized as components for the …

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Beauty Bloggers And Youtubers As A Community Of Practice, Valerie Gannon, Andrea Prothero Jan 2018

Beauty Bloggers And Youtubers As A Community Of Practice, Valerie Gannon, Andrea Prothero

Articles

Much consumption-related activity online is outside of what is understood traditionally as community and is via user-generated content (UGC), of which blogs and YouTube channels in particular dominate in the beauty sphere. Community of practice (CoP) theory from social learning and organisation studies offers an alternative way to understand these consumption-based UGC practices. This study combines data from 25 interviews with bloggers and YouTubers and their blog posts and videos. Among these UGC creators we find mutual engagement, shared repertoires and joint enterprise. This paper theorises consumption-based UGC creators as a CoP and contributes insights for mangers as to how …

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Enhancing The Crumb Rubber Modified Asphalt's Storage Stability Through The Control Of Its Internal Network Structure, Mohyeldin Ragab, Magdy Abdelrahman Jan 2018

Enhancing The Crumb Rubber Modified Asphalt's Storage Stability Through The Control Of Its Internal Network Structure, Mohyeldin Ragab, Magdy Abdelrahman

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The current research investigated the effect of the internal network structure developed in the crumb rubber modified asphalt (CRMA) on its storage stability. The authors investigated the influence of asphalt-crumb rubber modifier (CRM) interaction parameters (interaction time, interaction speed, and interaction temperature) on the development of the internal network structure in CRMA. The authors found that the existence of three dimensional (3D) network structures in the CRMA enhanced its storage stability. Fourier Transform Infrared (FTIR) Spectroscopy was utilized to determine the nature of CRM components responsible for the development of 3D network structure in the liquid phase of CRMA. This …

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Decoupled, Linear, And Energy Stable Finite Element Method For The Cahn-Hilliard-Navier-Stokes-Darcy Phase Field Model, Yali Gao, Xiaoming He, Liquan Mei, Xiaofeng Yang Jan 2018

Decoupled, Linear, And Energy Stable Finite Element Method For The Cahn-Hilliard-Navier-Stokes-Darcy Phase Field Model, Yali Gao, Xiaoming He, Liquan Mei, Xiaofeng Yang

Mathematics and Statistics Faculty Research & Creative Works

In this paper, we consider the numerical approximation for a phase field model of the coupled two-phase free flow and two-phase porous media flow. This model consists of Cahn—Hilliard—Navier—Stokes equations in the free flow region and Cahn—Hilliard—Darcy equations in the porous media region that are coupled by seven interface conditions. The coupled system is decoupled based on the interface conditions and the solution values on the interface from the previous time step. A fully discretized scheme with finite elements for the spatial discretization is developed to solve the decoupled system. In order to deal with the difficulties arising from the …

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Failure Of The Alexander Dam Embankment And Reconstruction Using Drainage Mitigation On Kauai, Hawaii, 1930-1932, Kerry D. Cato, J. David Rogers Jan 2018

Failure Of The Alexander Dam Embankment And Reconstruction Using Drainage Mitigation On Kauai, Hawaii, 1930-1932, Kerry D. Cato, J. David Rogers

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Alexander Dam is a hydraulic fill earth dam and the second-highest embankment dam in Hawaii, having been built in 1929-1932 on the south side of the Hawaiian island of Kauai to provide irrigation for McBryde Sugar Company Ltd. It was constructed across Wahiawa Stream mauka (Hawaiian for "stream that comes from the mountains," literally "toward the mountains"), upstream of Kalaheo, to store 800 million gallons (5 million m3) of water to irrigate sugarcane fields. The embankment dam was intended to have a maximum height of 125 ft (38 m), a crest length of 620 ft (189 m), and a maximum …

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An Integrated Method For Forecasting Well Deliverability In Gas Condensate Reservoirs With Bottom Aquifer Drive, Abdulaziz Ellafi, Ralph E. Flori, Shari Dunn-Norman Jan 2018

An Integrated Method For Forecasting Well Deliverability In Gas Condensate Reservoirs With Bottom Aquifer Drive, Abdulaziz Ellafi, Ralph E. Flori, Shari Dunn-Norman

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Gas condensate reservoirs constitute a significant portion of global hydrocarbon reserves. In these reservoirs, liquids develop in the pore space once bottomhole pressure falls below dew point. This results in the formation of a liquid bank near the wellbore region which decreases gas mobility, which then reduces gas inflow. In such complex reservoirs, it is important to correctly describe PVT impacts, adjustments to well test analysis and inflow performance, and then combine all effects in the reservoir analysis. The literature contains many references to individual adjustments of PVT analysis, well testing, or inflow performance for gas condensate reservoirs, but few …

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Testing And Evaluation Of Shale Stability For Zubair Shale Formation, Ahmed K. Abbas, Ralph E. Flori, Ahmed Al-Anssari, Mortadha Alsaba Jan 2018

Testing And Evaluation Of Shale Stability For Zubair Shale Formation, Ahmed K. Abbas, Ralph E. Flori, Ahmed Al-Anssari, Mortadha Alsaba

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Zubair Formation consists of approximately 55% shale, which causes almost 70% of wellbore problems due to incompatibilities of drilling fluids and shale formations. The most common and effective solution to shale instability is through the design and selection of drilling fluids. Understanding the interaction between drilling fluids and shale has been a challenge due to the complexity of both physical and chemical variations in shale formations. This paper presents some of the important laboratory and well-site testing techniques that are often used by mud engineers for characterizing and remediating drilling fluids and shale interaction. Well-preserved shale samples were analyzed to …

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Advanced Ion Management To Improve Oil Recovery In Oil-Wet Carbonate-Sandstone Composite Reservoirs, Ali K. Alhuraishawy, Baojun Bai, Mingzhen Wei, Waleed H. Al-Bazzaz Jan 2018

Advanced Ion Management To Improve Oil Recovery In Oil-Wet Carbonate-Sandstone Composite Reservoirs, Ali K. Alhuraishawy, Baojun Bai, Mingzhen Wei, Waleed H. Al-Bazzaz

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Waterflooding with different ionic composition called advanced ion management which play a role with ionic composition of injected water to enhance the oil production. In the last decade, many studies pointed out that the composition of injected water could changes rock wettability during waterflooding. The main purpose of this study is to evaluate the effects of SO4 and low salinity water on improving oil recovery in oil-wet carbonate reservoirs. Sulfate ion concentration, low salinity water, rock composition, porosity, and permeability were examined using a designed model. Typical seawater, increase SO4, two and three times in the seawater, and …

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Miscible Gases Based Eor In Unconventional Liquids Rich Reservoirs: What We Can Learn, Dheiaa Alfarge, Mortadha Alsaba, Mingzhen Wei, Baojun Bai Jan 2018

Miscible Gases Based Eor In Unconventional Liquids Rich Reservoirs: What We Can Learn, Dheiaa Alfarge, Mortadha Alsaba, Mingzhen Wei, Baojun Bai

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Over the last decade, Unconventional Liquids Rich Reservoirs (ULR) have become the main target for oil and gas investors as conventional formations started to deplete and diminish in numbers. These unconventional plays have a huge oil reserve; however, the primary oil recovery factor is predicted to be less than 10%. Unconventional Improved Oil Recovery (UIOR) techniques are still a new concept in the oil industry since there is no commercial project reported for any IOR technique yet. Miscible gas based EOR technique might be the most potential strategy to improve oil recovery in such complex plays. In this study, a …

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New Insights Of Low Salinity Water Flooding In Low Permeability-Low Porosity Clay Rich Sandstone Reservoir, Ali K. Alhuraishawy, Baojun Bai, Mingzhen Wei, Waleed H. Al-Bazzaz Jan 2018

New Insights Of Low Salinity Water Flooding In Low Permeability-Low Porosity Clay Rich Sandstone Reservoir, Ali K. Alhuraishawy, Baojun Bai, Mingzhen Wei, Waleed H. Al-Bazzaz

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

One of the EOR technologies is low-salinity water flooding (LSWF) is an EOR method that operates at a lower cost than other EOR methods, which makes it a preferred area of interest for oil industry economists, who continue to call for EOR costs to come down. The aim is to minimize the possible cost to recover as much oil as possible. The performance of low salinity waterflooding in decreasing residual oil saturation in low permeability-porosity clay-rich sandstone reservoir. Porosity test, core flooding test, XRD and scanning electron microscopy (SEM) tests were achieved in this study. Salinity effect on the porosity, …

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Application Of Integrated Reservoir Geomechanics For Well Planning Of High-Angled Wells In A Mature Oil Field, Ahmed K. Abbas, Ralph E. Flori, Yousif M.B. Al-Asadi, Mortadha Alsaba, Nasser A. Al-Hamad Jan 2018

Application Of Integrated Reservoir Geomechanics For Well Planning Of High-Angled Wells In A Mature Oil Field, Ahmed K. Abbas, Ralph E. Flori, Yousif M.B. Al-Asadi, Mortadha Alsaba, Nasser A. Al-Hamad

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Zubair oil reservoir has a significant potential to contribute to the petroleum supply in Iraq. Drilling highly deviated wells is a commonly used approach to enhance the production in mature fields. Drilling these wells in the Zubair Formation has been a challenge due to severe wellbore instability issues. This study presents how integrated reservoir geomechanics was used for efficient well planning and safe drilling of nearly horizontal wells (75° Inclination) through Zubair depleted sandstone oil reservoir. In this study, an integrated workflow was implemented mainly to build a geomechanical model using offset well data. The in-situ principal stresses and their …

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Learning From Experience: An Automatic Ph Neutralization System Using Hybrid Fuzzy System And Neural Network, Ethar H.K. Alkamil, Seaar Al-Dabooni, Ahmed K. Abbas, Ralph Flori, Donald C. Wunsch Jan 2018

Learning From Experience: An Automatic Ph Neutralization System Using Hybrid Fuzzy System And Neural Network, Ethar H.K. Alkamil, Seaar Al-Dabooni, Ahmed K. Abbas, Ralph Flori, Donald C. Wunsch

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

In oil and gas industry, the pH level is one of the most important indicators of mud contamination while drilling. Although the process has simple components, the pH neutralization process is complicated in the mud circulation system. This difficulty is due to the high nonlinearity of the process. In this paper, the fuzzy neural network (FNN) is integrated to the fuzzy logic controller (FLC) to create a system which identifies pH fluctuation into a drilling mud system, assesses and signals its severity. And then, it automatically actuates a chemical treating fluids valve (CTFV), such as Caustic Soda (CS), for neutralizing …

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Using Managed Pressure Drilling To Reduce Stuck Pipe Problem, Ethar H.K. Alkamil, Husam R. Abbood, Ralph E. Flori, George Medley, Sagar Nauduri, Mortadha Alsaba Jan 2018

Using Managed Pressure Drilling To Reduce Stuck Pipe Problem, Ethar H.K. Alkamil, Husam R. Abbood, Ralph E. Flori, George Medley, Sagar Nauduri, Mortadha Alsaba

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Differences between mud pressure in a wellbore and pore pressure in high permeability rocks can lead to differential sticking, particularly when drilling deviated wells and encountering mud losses. Several solutions, all challenging, can be used to address this problem, where the conventional mitigation method of managing the mud weight (MW) is often used. However, managed pressure drilling (MPD) offers a promising solution with a positive risk-adjusted cost and other benefits. Wells in the E oilfield in southern Iraq are typically drilled overbalanced and therefore often experience a high percentage of non-productive time (NPT) due to differential sticking. This study evaluates …

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Computational Modeling Of Heat Transport And Volatile Extraction From Asteroid Materials, Joel C. Sercel, Mark A. Crawford, Christopher Dreyer, Egboche Unobe, Robert Jedicke, Stanley Love, Leslie S. Gertsch Jan 2018

Computational Modeling Of Heat Transport And Volatile Extraction From Asteroid Materials, Joel C. Sercel, Mark A. Crawford, Christopher Dreyer, Egboche Unobe, Robert Jedicke, Stanley Love, Leslie S. Gertsch

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

This paper presents the results of a program of computational modeling focused on elucidating the physics and chemical processes associated with the extraction of volatile materials from asteroid feedstocks with an eye toward use of the extracted materials for propulsion, radiation shielding, and replenishment of mission consumables. We present a math model of conductive heat transport, chemical processes, and gas escape by Darcian diffusion. Chemical processes in the model include pyrolysis of organic chemical constituents and thermal dehydration and decarbonization of hydrates and carbonates. The model is implemented in a spherical finite difference computational engine that predicts time histories of …

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A Novel Ultra-Low Interfacial Tension Nanofluid For Enhanced Oil Recovery In Super-Low Permeability Reservoirs, Derong Xu, Baojun Bai, Ziyu Meng, Qiong Zhou, Zhe Li, Yao Lu, Hairong Wu, Jirui Hou, Wanli Kang Jan 2018

A Novel Ultra-Low Interfacial Tension Nanofluid For Enhanced Oil Recovery In Super-Low Permeability Reservoirs, Derong Xu, Baojun Bai, Ziyu Meng, Qiong Zhou, Zhe Li, Yao Lu, Hairong Wu, Jirui Hou, Wanli Kang

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

The exploration and development of super-low permeability reservoirs have become a global focus in recent years. However, conventional flooding systems commonly face problems of high injection pressure and poor displacement efficiency in super-low permeability reservoirs. Thus, it is imperative to find new flooding agents that tackle such problems. In this study, a novel ultra-low interfacial tension (IFT) nanofluid was formulated, consisting of surfactants to achieve ultra-low IFT and silica nanoparticles to reduce injection pressure. The compatibility test between the surfactants and silica nanoparticles in 10,000 mg/L NaCl solution at 90 °C was conducted to ensure their adaption to harsh reservoir …

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A Preliminary Evaluation Of The Ability Of Keratotic Tissue To Act As A Prognostic Indicator Of Hip Fracture Risk, J. Renwick Beattie, Diane Feskanich, M. Clare Caraher, Mark R. Towler Jan 2018

A Preliminary Evaluation Of The Ability Of Keratotic Tissue To Act As A Prognostic Indicator Of Hip Fracture Risk, J. Renwick Beattie, Diane Feskanich, M. Clare Caraher, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

Studies have shown that Raman spectroscopic analysis of fingernail clippings can help differentiate between post-menopausal women who have and who have not suffered a fracture. However, all studies to date have been retrospective in nature, comparing the proteins in nails sourced from women, post-fracture. The objective of this study was to investigate the potential of a prospective test for hip fracture based on spectroscopic analysis of nail tissue. Archived toenail samples from post-menopausal women aged 50 to 63 years in the Nurses' Health Study were obtained and analysed by Raman spectroscopy. Nails were matched case-controls sourced from 161 women; 82 …

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The Impact Of Gallium Content On Degradation, Bioactivity, And Antibacterial Potency Of Zinc Borate Bioactive Glass, Alireza Rahimnejad Yazdi, Lawrence Torkan, Wendy Stone, Mark R. Towler Jan 2018

The Impact Of Gallium Content On Degradation, Bioactivity, And Antibacterial Potency Of Zinc Borate Bioactive Glass, Alireza Rahimnejad Yazdi, Lawrence Torkan, Wendy Stone, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

Zinc borate glasses with increasing gallium content (0, 2.5, 5, 10, and 15 Wt % Ga) were synthesized and their degradation, bioactivity in simulated body fluid (SBF), and antibacterial properties were investigated. ICP measurements showed that increased gallium content in the glass resulted in increased gallium ion release and decreased release of other ions. Degradability declined with the addition of gallium, indicating the formation of more symmetric BO3 units with three bridging oxygens and asymmetric BO3 units with two bridging oxygens in the glass network as the gallium content in the series increased. The formation of amorphous Ca-P …

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A Simple Model For Elastic-Plastic Contact Of Granular Geomaterials, Jian Wang, Qimin Li, Changwei Yang, Yidan Huang, Caizhi Zhou Jan 2018

A Simple Model For Elastic-Plastic Contact Of Granular Geomaterials, Jian Wang, Qimin Li, Changwei Yang, Yidan Huang, Caizhi Zhou

Materials Science and Engineering Faculty Research & Creative Works

We propose a simple elastic-plastic contact model by considering the interaction of two spheres in the normal direction, for use in discrete element method (DEM) simulations of geomaterials. This model has been developed by using the finite element method (FEM) and nonlinear fitting methods, in the form of power-law relation of the dimensionless normal force and displacement. Only four parameters are needed for each loading-unloading contact process between two spheres, which are relevant to material properties evaluated by FEM simulations. Within the given range of material properties, those four parameters can be quickly accessed by interpolating the data appended or …

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A Rupture Limit Equation For Pre-Loaded Composite Plates, William P. Schonberg Jan 2018

A Rupture Limit Equation For Pre-Loaded Composite Plates, William P. Schonberg

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Fiber-reinforced polymer composites offer inherent advantages over traditional metallic materials in a number of different ways; however, these materials are also highly susceptible to impact damage. In this paper, we explore the response of FRP (fiber reinforced polymer) composites under impact conditions that could result in their rupture or catastrophic failure. The work performed was aimed at developing a general, data-driven equation for initially-stressed, flat, composite plates that would differentiate between impact conditions that would result in only a hole or crack and those which would cause catastrophic plate failure or rupture. If this equation were to be subsequently shown …

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Behavior Of Eb Frp Masonry Bond Under Service Temperature, Zuhair Al-Aljaberi, John J. Myers, K. Chandrashekhara Jan 2018

Behavior Of Eb Frp Masonry Bond Under Service Temperature, Zuhair Al-Aljaberi, John J. Myers, K. Chandrashekhara

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The interest in advanced composites in repairing and strengthening infrastructure systems has considerably increased, especially as the application externally bonded (EB) fiber reinforced polymer (FRP) has become more well established. Previous research on bond behavior has focused on impact of durability by considering exposure to harsh environmental conditions and testing the specimens after exposure, rather than testing bond performance during exposure. The influence of directly applying temperature on bond behavior represents an open topic that needs to be investigated in more detail. This study is one of the first studies to investigate the bond behavior when the composite is subjected …

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